Edexcel Physics – P2


The quantity power is the rate at which work is done. The quicker work is done the greater the power
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The size of the current is the rate of flow of charge. Electrons are negatively charged particles and which transfer energy through wires as electricity
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Resistance is an electrical quantity that measures how the device or material reduces the electric current flow through it
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Electrical power

The power of an appliance is the energy that is transferred per second. Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit
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Density is a measure of how compact the particles are in a substance. Density is defined as the mass per unit volume
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Energy transformed

The potential difference between two points is the energy transferred per unit charge. An electrical circuit is an energy transformation device.
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Edexcel Physics – P1

Half life

The radioactivity of a sample decreases over time. Half life is a measurement of this decrease
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