Recent questions and answers in Basic concepts

2 answers 76 views

If an incandescent lamp of 80 ohms resistance takes a current of 0.75 ampere, what voltage is required to light it? A.45 volts B.60 volts c.23 volts D.None of these

answered Nov 15, 2018 in Basic concepts
0 answers 66 views
asked Oct 22, 2018 in Basic concepts
0 answers 118 views
0 answers 26 views
2 answers 30 views

The hot resistance of the bulb's filament is higher than its cold resistance because the temperature co-efficient of the filament is?

answered Aug 15, 2018 in Basic concepts
1 answer 42 views

Heat in a conductor is produced on the passage of electric current due to?

answered Aug 15, 2018 in Basic concepts
1 answer 61 views

State and explain Ohm's law for magnetic circuit.

answered Aug 10, 2018 in Basic concepts
1 answer 23 views
1 answer 23 views

An ideal power supply consist of   (A) Very small output resistance (B) Zero Internal resistance (C) Very large input resistance (D) Very large output resistance

answered May 17, 2018 in Basic concepts
1 answer 19 views

When a sine wave has a frequency of 100 Hz in 12 s it goes through? A.1/100 cycle B.12 cycles C.120 cycles D.1,200 cycles

answered May 15, 2018 in Basic concepts
1 answer 51 views

In order to get maximum power transfer from a capacitive source, the load must? A.have a capacitive reactance equal to circuit resistance B.have an impedance that is the complex conjugate of the source impedance C.be as capacitive as it is inductive D.none of the above

answered May 15, 2018 in Basic concepts
1 answer 8 views

Fourteen milliamperes can be expressed as? A.14 MA B.14 μA C.14 kA D.14 mA

answered May 15, 2018 in Basic concepts
1 answer 15 views

How much voltage is needed to produce 2.5 A of current through a 200 ohms resistor? A.50 V B.500 V C.80 V D.8 V

answered May 15, 2018 in Basic concepts
1 answer 50 views

When there is 12 mA of current through a 1.2 k ohms resistor, the voltage across the resistor is? A.14.4 V B.1.4 V C.100 V D.10 V

answered May 15, 2018 in Basic concepts
1 answer 19 views

How much resistance is needed to draw 17.6 mA from a 12 volt source? A.212 ohms B.6.8 kohms C.68 ohms D.680 ohms

answered May 15, 2018 in Basic concepts
1 answer 19 views

When placed close together, two positively charged materials will? A.attract B.become neutral C.become negative D.repel

answered May 15, 2018 in Basic concepts
1 answer 21 views

The colored bands for a 4,700 ohm resistor with a ten percent tolerance are? A.yellow, violet, red, gold B.yellow, violet, orange, gold C.yellow, violet, red, silver D.orange, violet, red, silver

answered May 15, 2018 in Basic concepts
1 answer 26 views

A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt- hours of energy does it consume? A.20.16 kWh B.201.6 kWh C.2.01 kWh D.8.4 kWh

answered May 15, 2018 in Basic concepts
1 answer 11 views

When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is? A.12 V B.120 V C.240 V D.2,400 V

answered May 15, 2018 in Basic concepts
1 answer 10 views

In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is? A.one-fourth the primary current B.four times the primary current C.equal to the primary current D.one-fourth the primary current and equal to the primary current

answered May 15, 2018 in Basic concepts
1 answer 11 views

In a Y-connected circuit, the magnitude of each line current is? A.one-third the phase current B.three times the corresponding phase current C.equal to the corresponding phase current D.zero

answered May 15, 2018 in Basic concepts
1 answer 24 views

The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 ohms load. The turns ratio is 3:1. What is the secondary voltage? A.2 V B.20 V C.180 V D.18 V

answered May 15, 2018 in Basic concepts
1 answer 547 views

The turns ratio required to match an 80 ohms source to a 320 ohms load is? A.80 B.20 C.4 D.2

answered May 15, 2018 in Basic concepts
1 answer 47 views

When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is? A.overheated B.shorted C.open D.reversed

answered May 15, 2018 in Basic concepts
1 answer 16 views

A resistance of 3.3 M ohms is connected across a 500 V source. The resulting current is approximately? A.15.1 μA B.151 μA C.66 mA D.660 mA

answered May 15, 2018 in Basic concepts
1 answer 22 views

The formula to find I when the values of V and R are known is? A.I = VR B.I = R/V C.V = IR D.I = V/R

answered May 15, 2018 in Basic concepts
1 answer 26 views

When converting 0.16 mA to microamperes, the result is? A.16 μA B.160 μA C.1,600 μA D.0.0016 μA

answered May 15, 2018 in Basic concepts
1 answer 14 views

The average value of a 12 V peak sine wave over one complete cycle is? A.0 V B.1.27 V C.7.64 V D.6.37 V

answered May 15, 2018 in Basic concepts
1 answer 27 views

Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is? A.16.54 V B.1.65 V C.10.60 V D.5.93 V

answered May 15, 2018 in Basic concepts
1 answer 28 views

A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is? A.0.2 B.0.4 C.5 D.25

answered May 15, 2018 in Basic concepts
1 answer 17 views

If it takes 400 ms to use 12,000 J of energy, the power is? A.30 kW B.30 W C.3 W D.300 kW

answered May 15, 2018 in Basic concepts
1 answer 21 views

A material that does not allow current under normal conditions is a(n)? A.insulator B.conductor C.semiconductor D.valence

answered May 15, 2018 in Basic concepts
1 answer 7 views

Current flows in a circuit when? A.a switch is opened B.a switch is closed C.the switch is either open or closed D.there is no voltage

answered May 15, 2018 in Basic concepts
1 answer 15 views

Four amperes of current are measured through a 24 ohms resistor connected across a voltage source. How much voltage does the source produce? A.960 V B.9.6 V C.96 V D.8 V

answered May 15, 2018 in Basic concepts
1 answer 10 views

You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed? A.9 V B.900 mV C.0 V D.18 V

answered May 15, 2018 in Basic concepts
1 answer 20 views

How much resistance is required to limit the current from a 12 V battery to 3.6 mA? A.3.3 k ohms B.33 k ohms C.2.2 k ohms D.22 k ohms

answered May 15, 2018 in Basic concepts
1 answer 15 views

The number of millivolts in 0.06 kilovolts is? A.600 V B.6,000 mV C.60,000 mV D.600,000 mV

answered May 15, 2018 in Basic concepts
1 answer 13 views

A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of? B.12 kHz C.18 kHz D.1.3 MHz

answered May 15, 2018 in Basic concepts
1 answer 12 views

If a transformer has 50 turns in the primary winding and 10 turns in the secondary winding, what is the reflective resistance if the secondary load resistance is 250 ohms? A.250 ohms B.25 ohms C.6,250 ohms D.62,500 ohms

answered May 15, 2018 in Basic concepts
1 answer 8 views

How many watt-hours represent 65 W used for 18 h? A.11.7 Wh B.1,170 Wh C.11,700 Wh D.117,000 Wh

answered May 15, 2018 in Basic concepts
1 answer 15 views

In 0.025 W, there are? A.25 kW B.0.00025 mW C.2,500 μW D.25 mW

answered May 15, 2018 in Basic concepts
1 answer 25 views

A two-terminal variable resistor is known as a? A.potentiometer B.thermistor C.rheostat D.wiper

answered May 15, 2018 in Basic concepts
1 answer 13 views

The minimum resistance value for a blue, gray, red, silver resistor is? A.612 ohms B.6,120 ohms C.6,800 ohms D.6,460 ohms

answered May 15, 2018 in Basic concepts
1 answer 11 views

Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor? A.4 ohms B.400 ohms C.4 kohms D.4.4 ohms

answered May 15, 2018 in Basic concepts
1 answer 17 views

Approximately how many milliamperes of current flow through a circuit with a 40 V source and 6.8 k ohms of resistance? A.27.2 mA B.59 mA C.5.9 mA D.590 mA

answered May 15, 2018 in Basic concepts
1 answer 224 views

When converting 7,000 nA to microamperes, the result is? A.0.007 μA B.0.7 μA C.700 μA D.7 μA

answered May 15, 2018 in Basic concepts
1 answer 9 views

If the peak value of a sine wave is 30 V, the rms value is? A.19.08 V B.7.07 V C.0.707 V D.23.10 V

answered May 15, 2018 in Basic concepts
1 answer 12 views

A constant load power means a uniform conversion of? A.mechanical to electrical energy B.electrical to mechanical energy C.current to voltage D.voltage to current

answered May 15, 2018 in Basic concepts
1 answer 10 views

The turns ratio of a transformer having 200 primary turns and 1,200 secondary turns is? A.6 B.24 C.1.66 D.66

answered May 15, 2018 in Basic concepts
1 answer 15 views

If you used 600 W of power for 60 h, you have used? A.36 kWh B.3.6 kWh C.10 kWh D.1 kWh

answered May 15, 2018 in Basic concepts
To see more, click for all the questions in this category.

Welcome to electronics2electrical.com here you can ask questions related to electrical, electronics, mechanical, telecommunication, instrumentation, computer, mathematics, physics etc.
Be respectful to all the members. Do not copy and paste the answers from other websites which have copyright content. While asking question give full details about it.

Categories

Most popular tags

power motor dc circuit transformer voltage current used system phase resistance factor synchronous load ac energy induction electric generator series frequency between speed capacitor use electrical meter line difference control type mosfet transmission magnetic plant high single instrument bjt unit source advantages function diode and machine winding field define torque parallel amplifier supply shunt thyristor motors electricity arduino maximum time relay armature problem value on transformers types coil diagram state flow ratio material three formula starting direction theorem method emf operating efficiency digital wave microprocessor test instruments inductance loss measure operation connected signal low applications effect single-phase network temperature working constant losses different law wattmeter measuring compare controlled breaker drive device logic rc full switch flux wire resistivity disadvantages free of materials machines angle force converter conductor transistor gain open protection scr core measurement number bridge principle generators reactance circuits negative the friction iron loop short pole battery conservation steam resistors hysteresis computer using analog lines secondary station gate a rectifier inverter linear induced relays nuclear capacitance basic characteristics design direct work rotor electronics ammeter forces diesel damping rlc connection factors capacitors minimum insulation moving regulation running self systems air fault range main stability quality starter igbt eddy alternator ideal rl average 3-phase plants arc thermal error fuzzy biasing dielectric pressure balanced superposition errors copper rotation feedback impedance measured electronic electrons charge inductive transfer explain start off back curve over solar is three-phase tariff locomotive peak bias zener engineering commutator surge conductors rating universal potentiometer density permanent mechanical transducer capacity memory adc excitation two fuse pure harmonics application semiconductor inductor internal pmmc reaction welding resonance traction permeability breakers rms designed electromagnetic si generation brushes switching capacitive shaded rate 1 distribution resistor methods delta star oscillator reluctance simplification algebra 8085 boolean weston dynamometer insulating strength installation definition fuel heating earth units

8,450 questions

7,047 answers

132 comments

3,085 users

...