What happenes when insulating materials are rubbed together?
They become charged.
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What is transferred when objects become charged?
Electrons.
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What happens when charges are brought together?
Like charges repel,unlike charges attract.
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What is the difference between a battery and a cell?
A battery consists of two or more cells conected together.
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What determines the size of an electric current?
The rate of flow of charge.
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How do we calculate electric current?
Charge flow divided by time taken.
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What do we mean by potential difference?
Work done or energy transferred (in joules) divided by charge (in coulombs).
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What is resistance and what is its unit?
Resistance (in ohms)=potential difference(volts) divided by current (amps).
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What is Ohm's law?
Ohm's law states that the current through a resistor at a constant temperature is directly proportional to the potentil difference across the resistor.
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What happens if you reverse the current in a resistor?
Reversing the current thorugh a component reverses the pd across it.
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what happens to the resistance of a filament bulb as its temperature increases?
Resistance increases with increase of the filament temperature.
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How does the current through a diode depend on the potential difference across it?
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