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Electric Current

Electric current is the rate at which electric charge flows through a conductor.

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Student-friendly explanation

In simple terms, current tells us how fast charge is moving in a circuit. If more charge passes a point in less time, the current is larger. Its SI unit is ampere, and it is a basic quantity used in every circuit calculation.

How to write this in exams

  1. 1

    Start with the exact idea

    Electric current is the rate at which electric charge flows through a conductor.

  2. 2

    Then show how to use it

    1. Note the charge Q in coulombs. 2. Note the time t in seconds. 3. Apply I = Q/t. 4. Divide carefully and write the answer with unit A.

  3. 3

    Add one concrete example

    If 10 coulombs of charge pass through a wire in 2 seconds, the current is 5 ampere.

  4. 4

    Avoid this incomplete answer

    A common wrong answer is to write 12 A for 12 C in 3 s. That is wrong because current is a rate, not the total charge.

Definition

Electric current is the rate at which electric charge flows through a conductor.

Example

If 10 coulombs of charge pass through a wire in 2 seconds, the current is 5 ampere.

Rule to remember

I = Q/t, where I is current, Q is charge, and t is time. 1 A = 1 C/s.

Memory hook

Current means charge flow per second.

Examples and method

Worked example

A wire carries 12 C of charge in 3 s. Using I = Q/t, current = 12/3 = 4 A. So the current in the wire is 4 ampere.

Method to apply

1. Note the charge Q in coulombs. 2. Note the time t in seconds. 3. Apply I = Q/t. 4. Divide carefully and write the answer with unit A.

Diagram support

Draw a simple circuit with a battery, a wire, and an ammeter connected in series. Mark the direction of conventional current clearly.

How CBSE asks it

Usually asked as a short numerical using charge and time, or as a concept question on the meaning of ampere.

Avoid common mistakes

Common confusion

Many students write the total charge as current instead of dividing charge by time.

Common wrong answer

A common wrong answer is to write 12 A for 12 C in 3 s. That is wrong because current is a rate, not the total charge.

Exam tip

Always write the unit as ampere and use I = Q/t in numerical questions.

Quick check

If 15 C of charge passes through a wire in 5 s, what is the current?

The current is 3 A because current equals charge divided by time, so 15 divided by 5 gives 3 ampere.

Answer writing and exam use

1-mark answer

Electric current is the rate at which electric charge flows through a conductor.

2-mark answer

Electric current is the rate at which electric charge flows through a conductor. I = Q/t, where I is current, Q is charge, and t is time. 1 A = 1 C/s. If 10 coulombs of charge pass through a wire in 2 seconds, the current is 5 ampere.

3-mark answer

In simple terms, current tells us how fast charge is moving in a circuit. If more charge passes a point in less time, the current is larger. Its SI unit is ampere, and it is a basic quantity used in every circuit calculation. I = Q/t, where I is current, Q is charge, and t is time. 1 A = 1 C/s. A wire carries 12 C of charge in 3 s. Using I = Q/t, current = 12/3 = 4 A. So the current in the wire is 4 ampere. Usually asked as a short numerical using charge and time, or as a concept question on the meaning of ampere. A common wrong answer is to write 12 A for 12 C in 3 s. That is wrong because current is a rate, not the total charge.
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