Current Electricity - Electric Current
Q. If a circuit has a voltage of 12 V and a resistance of 3 ohms, what is the current flowing through the circuit? (2022)
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A.
4 A
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B.
3 A
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C.
2 A
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D.
1 A
Solution
Using Ohm's law (I = V/R), I = 12 V / 3 Ω = 4 A.
Correct Answer: A — 4 A
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Q. What is the charge of one coulomb in terms of the number of electrons? (2023)
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A.
6.25 x 10^18 electrons
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B.
1.6 x 10^-19 electrons
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C.
3.2 x 10^-19 electrons
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D.
1.0 x 10^18 electrons
Solution
One coulomb is equivalent to approximately 6.25 x 10^18 electrons.
Correct Answer: A — 6.25 x 10^18 electrons
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Q. What is the effect of increasing the temperature of a conductor on its resistance? (2019)
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A.
Resistance decreases
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B.
Resistance increases
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C.
Resistance remains constant
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D.
Resistance fluctuates
Solution
Generally, the resistance of a conductor increases with an increase in temperature.
Correct Answer: B — Resistance increases
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Q. What is the relationship between current (I), charge (Q), and time (t)? (2022)
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A.
I = Q × t
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B.
I = Q / t
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C.
I = t / Q
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D.
I = Q + t
Solution
The relationship is given by I = Q / t, where I is current, Q is charge, and t is time.
Correct Answer: B — I = Q / t
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Q. What is the SI unit of electric current? (2021)
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A.
Volt
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B.
Ohm
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C.
Ampere
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D.
Coulomb
Solution
The SI unit of electric current is the Ampere (A).
Correct Answer: C — Ampere
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Q. What is the total current flowing in a circuit with three resistors in parallel, each carrying 2 A? (2021)
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A.
2 A
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B.
4 A
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C.
6 A
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D.
8 A
Solution
In parallel, the total current is the sum of the currents: 2 A + 2 A + 2 A = 6 A.
Correct Answer: C — 6 A
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Q. Which of the following materials is a good conductor of electricity? (2019)
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A.
Rubber
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B.
Copper
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C.
Glass
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D.
Wood
Solution
Copper is a good conductor of electricity due to its high number of free electrons.
Correct Answer: B — Copper
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Q. Which of the following statements is true regarding electric current? (2020)
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A.
It flows from negative to positive
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B.
It flows from positive to negative
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C.
It does not require a closed circuit
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D.
It is independent of voltage
Solution
Electric current flows from positive to negative in a circuit.
Correct Answer: B — It flows from positive to negative
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