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Learning outcomes for this UNIT:
Learning outcomes for this UNIT:
By the end of the topic, learners will be able to:
• Explain that conductors heat up when current passes through them
• Explain that some energy is ‘lost’/ ’wasted’ from conductors as heat
• Describe what a resistor is
• Describe how a resistor works
• List uses of resistors.
• List four factors that affect resistance in a circuit
• Discuss four factors that affect resistance in a circuit
• Investigate the effect of the length of a conductor on resistance.
• List four factors that affect resistance in a circuit
• Discuss four factors that affect resistance in a circuit
• Investigate the effect of different materials on resistance.
RESISTANCE - USES OF RESISTORS
RESISTANCE - USES OF RESISTORS
(a) A conductor allows electric current to pass through it.
(b) Some of the energy in a conductor is lost as heat when the conductor heats up.
(c) All conductors have some resistance but the resistance differs from one conductor to another.
(d) A resistor controls the movement of current as it passes through.
(e) Resistors change electric energy into useful energy e.g. for cooking, light, ironing etc.
Complete this activity in your books and upload a picture on Google Classroom. A link will be opened named Classwork 1 Resistance
1. What is a conductor?
2. Explain how energy is lost through a conductor.
3. Discuss why it is important for materials to have resistance. Use examples of some appliances in your explanation.
4. Explain the importance of resistors, make use of 5 appliances as your examples, and explain how resistance makes those appliances useful.
5. Suggest how you can build a bulb that can light up the whole school. Mention resistance in your explanation.
6. Research one appliance you use at home to find out how it works. Try and sketch your own design of the appliance and give it a name.
FACTORS THAT AFFECT RESISTANCE IN A CIRCUIT
FACTORS THAT AFFECT RESISTANCE IN A CIRCUIT
(a) Different materials have different resistances because materials have different properties.
(b) Resistance is affected by the following:
o Thickness of the conductor – thicker conductors have less resistance and vice versa.
o Length of the resistor - longer conductors have more resistance and vice versa.
o Temperature of the resistance – higher temperature has higher resistance and vice versa.
o The type of material used as a conductor -different materials have different resistances.
Complete this activity in your books and upload a picture on Google Classroom. A link will be opened named Classwork 2 Resistance
1.Give details of the four factors affecting resistance.
2.Which factors are being investigated in the two diagrams?
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ADDITIONAL RESOURCES:
ADDITIONAL RESOURCES:
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