Physics concepts Electricity 1

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Ammeter

Back

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

Front

Ampere (Amp)

Back

The unit of current.

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Conductor

Back

A material that allows electrical charge to flow easily. Metals are particularly good conductors due to the free electrons in their structures.

Front

Coulomb

Back

The unit of charge.

Front

Currents at a Junction

Back

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

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Diode

Back

A component that only allows current to flow through in the forward direction, with very large resistances in the reverse direction.

Front

Earth Wire

Back

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

Front

Electric Current

Back

The rate of flow of electrical charge. Its value is the same at any position in a single closed loop. In metals, the charges that flow are electrons.

Front

Electrical heating

Back

Electrical energy is transferred to thermal energy when current does work against a resistance. In metals, this is a result of collisions between electrons and ions.

Front

Electrons

Back

Negatively charged particles that flow when a metal conducts electricity