Current Electricity - Electric Current

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Q1. What is the total current flowing in a parallel circuit with two branches carrying 2 A and 3 A respectively? (2023)

Solution:

In a parallel circuit, the total current is the sum of the currents in each branch: 2 A + 3 A = 5 A.

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Q2. What happens to the total current in a parallel circuit if one branch is disconnected? (2023)

Solution:

In a parallel circuit, if one branch is disconnected, the total current decreases.

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Q3. In a series circuit, if one resistor is removed, what happens to the current? (2023)

Solution:

In a series circuit, removing one resistor breaks the circuit, causing the current to become zero.

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Q4. What is the SI unit of electric current? (2021)

Solution:

The SI unit of electric current is the Ampere (A).

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Q5. If a circuit has a current of 3 A and a resistance of 4 Ω, what is the power consumed? (2020)

Solution:

Power (P) can be calculated using P = I² × R = (3 A)² × 4 Ω = 12 W.

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Q6. What is the effect of increasing the temperature of a conductor on its resistance? (2019)

Solution:

Generally, the resistance of a conductor increases with an increase in temperature.

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Q7. If a circuit has a voltage of 12 V and a resistance of 3 ohms, what is the current flowing through the circuit? (2022)

Solution:

Using Ohm's law (I = V/R), I = 12 V / 3 Ω = 4 A.

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Q8. What is the relationship between current (I), voltage (V), and resistance (R) in a circuit? (2021)

Solution:

The relationship is given by Ohm's law: I = V/R.

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Q9. Which of the following is a correct expression for electric current? (2022)

Solution:

The correct expression for electric current is I = V/R, according to Ohm's law.

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Q10. Which of the following statements is true about electric current? (2019)

Solution:

Electric current is defined as the flow of electrons in a conductor.