Static And Current Electricity Flashcards

1
Q

Static Electricity

A

A build up of le trip charge that can occur on good insulators e.g. polythene and Perspex rods.

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2
Q

Polythene rod

A

Gains electrons if a woollen cloth is rubbed on it ( becomes negatively charged).

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3
Q

Perspex Rod

A

Loses electrons if it’s rubbed by a woollen cloth ( becomes positively charged).

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4
Q

What is an electric current?

A

An electric current is caused by the flow of electrons through a good conductor such as metal.

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5
Q

Closed circuits

A

A closed circuit is needed for the current to flow.

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6
Q

Batteries

A

Energy provided by a battery or power pack is needed to move the current around the circuit.

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7
Q

Potential difference

A

The difference in electrical pressure between the positive and negative ends.

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8
Q

Resistance

A

The opposition to the flow of electrons. The unit is the Ohm and it is measured using an Ohmmeter.

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9
Q

Ohm’s Law

A

Oh’ms law states that voltage is directly proportional to current .

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10
Q

Direct current

A

Direct current goes in one direction only.

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11
Q

Alternating Current

A

Changes very quickly many times a second.

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