4-ELC-TEST
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Revision as of 08:16, 23 February 2010 by Mrsaunders (Talk | contribs)
Revision points:
- know that lamps and LEDs can be used to indicate the presence of current in a circuit
- explain why a series or parallel circuit is more appropriate for particular applications including domestic lighting
- understaned that the current in a series circuit dpends on the applied voltage and the number and nature of other components
- describe the qualitative effect of changing resistance on the circuit on the current in a circuit
- recall and use the relationship between voltage current and reistance V=IR
- describe how current varies with voltage in wires, resistors, metal filament lamps and diodes and how this can be investigated experimentally
- describe the qualitative variation of resistance of LDRs with illumination and of thermistors with temperature
- use the relationship between energy transfered, current, voltage and time:
E = IVt
- recall that mains electricity is alternating current (a.c.) and understand the difference between this and the direct current (d.c.) supplied by a cell or battery
In addition, pupils will need to revise content from the third year, namely:
- Pupils understand that atoms have a neutral charge
- Pupils understand that the movement of electrons (through friction) cause insulators to gain electrostatic charge
- Pupils understand that materials can be made to have a temporary charge by induction
- Pupils understand that electrostatic charges can apply forces on one another at a distance
- Pupils can describe dangers and uses of electrostatic charge
- Pupils can identify the coulomb as the unit of charge
- Pupils can identify the Ampere as the unit of current and that it is a SI Base Unit
- Pupils can use the equation Q = It and define current as the rate of flow of charge
- Pupils can identify the direction of movement of charge in a wire, charge in an electrolyte and the direction of flow of conventional current
- Pupils can be aware of electrical hazards and how to safely wire a plug
- Pupils can use the equation P=IV to find out how the power of a light bulb changes with V
