PS Unit 7 L4.1 - Explaining Electric Current

Front

What is electric current?

Back

Electric current is the flow of electric charge, typically measured in amperes (A). It represents the movement of electrons through a conductor.

Front

What device is used to measure electric current?

Back

An ammeter is used to measure the rate at which electric charges move through a wire.

Front

What is the unit of electric current?

Back

The unit of electric current is the ampere (A).

Front

Why is it difficult to track individual electric charges in a circuit?

Back

It is often impossible to track individual electric charges because there are too many charges moving at once.

Front

What happens to a device if the current drops below its required level?

Back

If the current drops below the required level, the device may not function properly.

Front

How does an ammeter measure electric current?

Back

An ammeter measures electric current by using a physical effect of electric current, such as the magnetic field created by the flow of charges.

Front

What is the role of a voltmeter?

Back

A voltmeter measures the voltage (potential difference) across two points in a circuit.

Front

What is resistance in an electrical circuit?

Back

Resistance is a measure of how much a material opposes the flow of electric current, measured in ohms (Ω).

Front

What is Ohm's Law?

Back

Ohm's Law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R). It can be expressed as V = I × R.

Front

What is a closed circuit?

Back

A closed circuit is a complete electrical loop that allows current to flow uninterrupted.