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6.5 Electrical Energy and Charge

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05 November 2014

6.5 Electrical Energy and Charge

How many meanings of the word charge can you think of?

05 November 2014

Page 192 AQA Physics

- What is electric current?
- What is the unit of electric charge?
- What energy changes take place when charge flows through a resistor?

Conventional current

Conventional current

electrons

In metals current is a flow of electrons. In all materials current is a flow of charged particles.

- Charge is measured in Coulombs, C.
- Charge flow = current x time
(Coulombs)(Amperes)(seconds)

E.g. A flow of 2A for 5s is a charge of 10 Coulombs.

Page 192 Q a)

The capacity store of a battery is shown as Amp-hours or milliamp-hours (mAh). This tells you how long a battery can deliver a certain current.

Energy transformed = potential difference x charge flow

From page 193 copy the worked example and answer b).

- An electric current is a flow of charge.
- When charge flows through a resistor, electrical energy is transferred as heat.
- Charge = Current x time
- Energy transferred = pd x time