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Electricity

Description: current electricity
Number of Questions: 17
Created by:
Tags: current electricity Electric Power and Energy Electric Charge and Current Heating Effect of Current Equivalent Combination of Resistances in Parallel and Series
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The amount of work done in Joules, when one unit electric charge moves from one point to another point in an electric circuit is known as

  1. potential difference

  2. electric current

  3. electric resistance

  4. electric inductance

  5. electric conductance

Show answer
Correct Option: A
Explanation:

In an electric field, the potential difference is the difference in electric potential between two points.

If two parallel-connected resistors dissipate 6 watts and 10 watts of power, then what is the total power loss?

  1. 60 W

  2. 0.6 W

  3. 16 W

  4. 1.66 W

  5. 166 W

Show answer
Correct Option: C
Explanation:

TOTAL POWER P = v^2*(R1+R2/R1*R2)  = V^2/R2+V^2/R1  = P1+P2  = 16W

A torch bulb draws a current of 0.2 A from a source of 2 V and glows. Calculate resistance of the torch bulb.

  1. 0.1Ω

  2. 0.4Ω

  3. 0.04Ω

  4. 10Ω

  5. 1Ω

Show answer
Correct Option: D
Explanation:

When the bulb glows: V = I R ---- Ohm's law R = V/I = 2/.2 =10 Ω

If 200 J of energy is used in 10 s, then calculate the power.

  1. 20 W

  2. 0.05 W

  3. 2000 W

  4. 0.33 W

  5. 120 KW

Show answer
Correct Option: A
Explanation:

p = w / t p = 200/10 = 20 W

If a lamp consumes 40 W in an hour and remains on for 1750 h, then calculate the kilowatt-hour consumption.

  1. 70,000 kwh

  2. 70 kwh

  3. 700 kwh

  4. 43750 kwh

  5. 4375 kwh

Show answer
Correct Option: B
Explanation:

We know that 1 kilowatt = 1000 watt. So, 40 watt = 40/1000 = 0.040 kwatt. Now as per the formula, 0.040 X 1750 = 70 kwh

What is the circuit current, if a 5 V, 60 Hz voltage is applied to 4.7 microF capacitor?

  1. 112.93 A

  2. 8.85 mA

  3. 0.94 mA

  4. 2823.3 A

  5. 23.5 mA

Show answer
Correct Option: B
Explanation:

Xc = 1/2*pi*f*c = 1/2*3.14*60*4.7*10^-6 Xc = 1/1770.96*10^-6  = 564.665 I = V / Xc = 5/564.665  = 0.008854 = 8.85*10^-3 = 8.85mA

What is the current in the wire every 2.0 seconds, if 10 C charge flows through it?

  1. 0.2 A

  2. 5 A

  3. 20 A

  4. 1200 A

  5. 12 A

Show answer
Correct Option: B
Explanation:

Current is the ratio of charge to time. The quantity of charge passing through a cross section in 2 seconds is 10 C. The ratio of charge to time isI = Q / t = ( 10 C) / ( 2 s) = 5 C/s = 5 Ampere

A bulb of resistance 22Ω is joined to a battery of 12 V. What is the value of the resistance to be connected in series, with the bulb in order to get current of 0.5 A?

  1. 23.95Ω

  2. 2Ω

  3. 18Ω

  4. 30Ω

  5. 46Ω

Show answer
Correct Option: B
Explanation:

If R is the equivalent resistance of the circuit, then R = V/I = 12/ 0.5 = 24 Ω But, R = R1 + R2, ∴ 24 = 22 + R2, ∴ R2 = 2 Ω

What is the inductive reactance, if frequency is 120 kHz, L is 10 m H?

  1. 7536 ohm

  2. 2400 ohm

  3. 62.8 m ohm

  4. 753.6 k ohm

  5. 7536 micro ohm

Show answer
Correct Option: A
Explanation:

XL = 2*pi*f*L so, 2*3.14*120 k*10 m = 7536ohm

The total opposition to the flow of current in a series RC circuit is called __________.

  1. inductance

  2. reactance

  3. impedance

  4. conductance

  5. capacitance

Show answer
Correct Option: C
Explanation:

Combination of resistance and capacitance gives impedance i.e. R+jXc. R is real part. Xc is imaginary part, which is combination of impedance.

Give the name of pentavalent material

  1. Arsenic

  2. Boron

  3. Gallium

  4. Aluminium

  5. Indium

Show answer
Correct Option: A
Explanation:

The Arsenic atom in arsenate has a valency of 5 and is also known as pentavalent arsenic.

How we can write capacitor value 102?

  1. 10,0000 pF

  2. 10000 pF

  3. 1000 pF

  4. 1 uf

  5. 1,000,000 pF

Show answer
Correct Option: C
Explanation:

102 means 10*10^2 pf.

If current is 400 mA and 200 ohm is the resistance, then calculate the power.

  1. 32 W

  2. 200 W

  3. 32 MW

  4. 0.0008 W

  5. 1250 W

Show answer
Correct Option: A
Explanation:

V = IR,  P = VI, P = I*I*R,  P = 400 10-3 400 * 10-3200 = 32 10-6 * 106,mili is converted into 10-3 and micro converted into10-6. Therefore, answer is = 32 W

Give the name of device, which cannot consists of a coil?

  1. Hartley oscillators

  2. Solenoid

  3. Relay

  4. Radio-receivers

  5. Transformers

Show answer
Correct Option: C
Explanation:

A relay is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism mechanically,

If battery has emf of 12 V with internal resistance as 5.0 x 10-2 W and the current of 90 A, then what is the terminal voltage of the battery?

  1. 7.5 V

  2. 11.95 V

  3. 4.5 V

  4. 16.5 V

  5. 12.05 V

Show answer
Correct Option: A
Explanation:

V = E - Ir Now, E = 12 V, I = 90 Ar = 5 x 10 -2 ΩV = 12 - 90 x 5 x 10 -2 = 7.5 V V = 12 - 4.5 = 7.5 V

If voltage is 12 V and the current through it is 500 micro A, then calculate the resistor value.

  1. 24 k ohm

  2. 24 micro ohm

  3. 6000 micro ohm

  4. 41.66 micro ohm

  5. 41.66 ohm

Show answer
Correct Option: A
Explanation:

Ohms law R = V/ I, so R = 12/ 500 micro = 24 k ohm

Calculate the current in a 60 W bulb plugged into a 120 V outlet.

  1. 0.5 A

  2. 2 A

  3. 7200 A

  4. 1.0 A

  5. 14400 A

Show answer
Correct Option: A
Explanation:

I = P / V = (60 W) / (120 V) = 0.5 A.

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