Electricity & Circuits

IGCSE Year 9 Physics - Electricity & Circuits Flashcards

The formula for charge is _.

Q = I × t

Ohm's Law is represented by the formula _.

V = I × R

The formula for electrical power is _.

P = V × I

Electrical energy can be calculated using the formula _.

E = P × t or E = Q × V

The unit of current is _.

Ampere (A)

The unit of voltage is _.

Volt (V)

The unit of resistance is _.

Ohm (Ohm)

In a series circuit, current is _.

It is the same through all components.

In a parallel circuit, voltage is _.

It is the same across all branches.

In series, resistance _.

It adds up: R_total = R1 + R2 + …

In parallel, resistance is calculated as _.

1/R_total = 1/R1 + 1/R2 + …

An ammeter is placed _ in a circuit.

In series with the component.

A voltmeter is placed _ in a circuit.

In parallel with the component.

A fuse is used _.

To break the circuit if the current is too high.

The purpose of earthing is _.

To prevent electric shock by directing excess current safely to the ground.

A conductor is _.

A material that allows electric current to pass through easily (e.g. metal).

An insulator is _.

A material that resists the flow of electric current (e.g. plastic).

The direction of electron flow in a circuit is _.

From negative to positive.

The direction of conventional current is _.

From positive to negative.

A variable resistor _.

It changes the resistance in a circuit.