Electricity - AQA GCSE

Front

Potential difference

Back

the potential energy per unit of charge.

Front

Rubbing the plastic strip with the cloth causes the strip to become negatively charged because ____________________ move from the cloth onto the plastic strip.

Back

Electrons

Front

The cloth is left with a ____________________ charge.

Back

positive

Front

For how many seconds is the current through the filament lamp greater than 1.5 A?

Back

0.08 s

Front

Why might the filament inside a lamp melt when the lamp is first switched on?

Back

The current goes higher than normal value.

Front

A lamp is connected to a 24 V power supply. The current through the lamp is 1.5 A. Calculate the power of the lamp.

Back

36 W

Front

LED lamps are much more efficient than filament lamps. What does this statement mean? Options: LED lamps have a similar power output to filament lamps, LED lamps waste a smaller proportion of the input energy than filament lamps, LED lamps have a higher power input than filament lamps, LED lamps waste a larger proportion of the input energy than filament lamps.

Back

LED lamps waste a smaller proportion of the input energy than filament lamps.

Front

What quantity does the ammeter measure?

Back

Current

Front

Calculate the resistance of the thermistor in Ohms when the current is 3.5 mA and the potential difference is 4.2 V.

Back

1200

Front

Calculate the charge that flows through the thermistor in 5 minutes when the current is 3.5 mA.

Back

1.05