GCSE Electricity 2

The diagram shows a temperature sensing circuit used to control a heating system in a house.

What quantity does the ammeter measure? (One correct word only needed)

(a)  

The diagram shows a temperature sensing circuit used to control a heating system in a house.

The current in the circuit is 3.5 mA when the potential difference across the thermistor is 4.2 V

Calculate the resistance of the thermistor in Ohms (Answer to 2 sig fig, no units needed)

(a)  

A student set up the electrical circuit shown in the figure.

The ammeter displays a reading of 0.10 A.

Calculate the potential difference (in Volts) across the 45 Ω resistor. (2 sig fig, no units needed).

(a)  

An example of an insulator of electricity is.....

• Rubber

• Silver

• Iron

• Copper

1. Which switch or switches must be closed to make the lamps light?

• Only switch 1

• Only switch 1

• Switches 1 and 2

• Switches 1 , 2 and 3

If lamp 2 is unscrewed from its holder, what will happen to lamp1?

• It will stay lit

• It will go out

• It will get dimmer

• It will dissapear

If the Voltage is increased and the resistance stays the same, Current will

• Increase
• Decrease
• Stay the same
• Not enough info

Current is...

• moving protons
• moving electrons
• measured in volts
• measured in ohms

What size resistor would produce a 3 Amp current flow with a 12 Volt battery

• 1 Ohm
• 3 Ohms
• 4 Ohms
• 12 Ohms

This is the symbol for a _____?

• an AC current source
• a DC current source
• a battery
• a single cell