Resistors summary

Draw the symbol for a variable resistor

A thermistor has a resistance that changes with (a)  

Which of these is a use for an l.e.d.

• All of these

• Fairy lights

• Traffic lights

• Car headlights

LEDs are popular in sustainable technology because they are:

• Energy efficient

• Expensive

• Noisy

• Large

Draw the symbol for a diode

How does a diode function in an electrical circuit?

Which two resistors can be used as sensors?

• light emitting diode

• light dependent resistor

• thermistor

• fixed resistor

List three uses for a variable resistor.

Which is the correct formula to calculate resistance?

• R = V x I

• R = I / V

• R = V / I

• R = P / I

What is the correct unit for current?

• volts (V)

• watts (W)

• amps (A)

• joules (J)