AQA AS Physics A Electric current
NOT FINISHED YET, BUT EYES ARE STARTING TO HURT SO WILL FINISH OFF TOMORROW :) X
- Created by: Charlotte
- Created on: 26-11-12 18:58
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- Electric Current
- Current and Charge
- Current is the rate of flow of charge. The current is caused by the movement of charge carriers.
- The electrons in the outer shells of atoms in metal are delocalised when they bond, this means that they are able to move within the metal and carry a charge.
- In solutions ions are able to move which means that they can carry a charge.
- Current is measured in Amperes (A) and is a base unit.
- Charge is measured in Coulombs (C). 1C is equal to the charge flow in 1 second when the current is 1A.
- Charge Q = Current I x time t.
- Current is the rate of flow of charge. The current is caused by the movement of charge carriers.
- Potential Difference and Power.
- The battery supplies each electron with potential energy.
- When an electron passes through a component, work is done, the amount of work done is equal to the loss of pd.
- Potential difference is the work done per unit charge.
- Work done W = Charge Q x pd V.
- The emf of a source of electricity is the electrical energy produced per unit charge passing throught the source
- Potential difference is the loss of energy. EMF is the gain of energy.
- Resistance
- Components and their characteristics
- Current and Charge
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