Current Electricity - Electric Current

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Q1. What happens to the total current in a parallel circuit when more branches are added? (2019)

Solution:

In a parallel circuit, adding more branches increases the total current.

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Q2. If a circuit has a current of 3 A and a resistance of 4 ohms, what is the power consumed? (2020)

Solution:

Power (P) is calculated using P = I^2 * R = (3 A)^2 * 4 ohms = 12 W.

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Q3. What is the SI unit of electric current? (2021)

Solution:

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

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Q4. What is the total current 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 the branches: 2 A + 3 A = 5 A.

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Q5. What is the relationship between current (I), charge (Q), and time (t)? (2022)

Solution:

The relationship is given by I = Q / t, where I is current, Q is charge, and t is time.

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Q6. What happens to the current in a parallel circuit if one branch is removed? (2019)

Solution:

In a parallel circuit, removing one branch does not affect the current in the other branches.

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Q7. 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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Q8. What is the effect of increasing the resistance in a circuit while keeping the voltage constant? (2019)

Solution:

According to Ohm's law, if resistance increases while voltage remains constant, current decreases.

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Q9. 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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Q10. What is the charge of one coulomb in terms of the number of electrons? (2023)

Solution:

One coulomb is equivalent to approximately 6.25 x 10^18 electrons.