Resistance of a wire practical + Insulation practical

Question 1

What is resistance?

Answer 1

Resistance is the opposition to the flow of the current

Question 2

How do you investigate the resistance of a wire?

Answer 2

Use a ruler to measure a wire at different lengths to see how resistance is affected by the length of a wire in a circuit

Question 3

How can you improve the accuracy of the resistance of a wire practical?

Answer 3

The accuracy can be improved by ensuring the switch is closed so that the wires don’t heat up, as resistance is affected by heat

Question 4

What is the independent variable in the resistance of a wire practical?

Answer 4

The length of the wire is the independent variable

Question 5

What is the dependant variable in the resistance of a wire practical?

Answer 5

The resistance of the wire is the dependant variable

Question 6

What is the control variable in the resistance of a wire practical?

Answer 6

The control variable is the temperature of the wire

Question 7

What is the process of insulation?

Answer 7

1) . place a small beaker into a large beaker
2) . pour boiling water from the kettle into the small beaker
3) . place cardboard lid over beakers with a hole suitable for thermometer
4) . put the thermometer into the hole
5) . record the temperature of the water inside the small beaker before starting the stopwatch
6) . record temperature every 2 minutes for 20 minutes
7) . repeat