Physics concepts Electricity 1

Fuse

• A device that stores electrical energy for later use.

• A safety device consisting of a thin metal filament that melts and cuts off the power supply if there is a surge in current.

• A type of circuit breaker that can be reset after tripping.

• A component that increases the voltage in a circuit.

Ampere (Amp)

• The unit of voltage.

• The unit of resistance.

• The unit of current.

• The unit of power.

Ammeter

• A device used to measure voltage across a component.

• A device connected in series with a component to measure the current that flows through it.

• A device that stores electrical energy for later use.

• A device that converts electrical energy into mechanical energy.

Currents at a Junction

• The sum of the currents entering a junction must always equal the sum of the currents leaving it, due to the conservation of charge.

• The sum of the currents entering a junction can be greater than the sum of the currents leaving it.

• Currents at a junction can be ignored if they are small enough.

• The total current at a junction is always zero.

Earth Wire

• The green and yellow striped safety wire connected to metal casings, preventing an appliance from becoming live.

• A wire that carries current to the power source.

• A wire that is used to connect two appliances together.

• A wire that is insulated to prevent electrical shock.

Light Dependent Resistor (LDR)

• A light sensitive component whose resistance decreases as its temperature increases.

• A device that converts light energy into electrical energy.

• A resistor that increases its resistance with increasing light intensity.

• A semiconductor that emits light when an electric current passes through it.

Electrons

• Negatively charged particles that flow when a metal conducts electricity

• Positively charged particles found in the nucleus of an atom

• Neutral particles that do not carry any charge

• Particles that are responsible for the strong nuclear force

Electrical heating

• Electrical energy is converted to mechanical energy when current flows through a conductor.

• Electrical energy is transferred to thermal energy when current does work against a resistance.

• Electrical energy is stored in batteries for later use.

• Electrical energy is transformed into light energy in incandescent bulbs.

Coulomb

• The unit of charge.

• A type of electrical circuit.

• A measure of voltage.

• A unit of resistance.

Light Emitting Diode

• A device that emits sound when a current flows through it.

• A device that gives out light when a current flows through it.

• A device that stores electrical energy for later use.

• A device that converts light into electrical energy.