P6a Resisting
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State the circuit symbols for resistor, variable resistor, bulb, cell, battery, switch and power supply.
Describe and recognise that a variable resistor can be used to vary the brightness of a lamp.
State the units of voltage, current and resistance.
State and recognise that for a given ohmic conductor the current increases as the voltage increases.
Describe and recognise that when a wire is hot its resistance increases.
Describe and explain the effect of a variable resistor in a circuit in terms of:
- control of the current;
- varying the brightness of a bulb or speed of a motor.
Use the equation:
resistance = voltage ÷ current.
Describe how a voltage-current graph can be used to find the resistance of an ohmic conductor.
Describe how a voltage-current graph shows the changing resistance of a non-ohmic device, such as a bulb.
Explain that the resistance is varied as a result of changing length of resistance wire in a variable resistor.
Use and manipulate the equation:
resistance = voltage ÷ current
Calculate the resistance of an ohmic conductor from a voltage-current graph.
Explain the shape of a voltage-current graph for a non-ohmic conductor, such as the filament in a lamp, in terms of changing resistance.
Objectives:
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Homework:
Homework1
Objectives:
Content 1
Prior Learning:
Difficult Concepts:
Outline:
Suggested Practicals:
Extension Activities:
Homework:
Homework2 again