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WorksheetsForces as vectors retrieval 3
Total questions: 10
Worksheet time: 5mins
Mains electricity is...
an alternating current (a.c.) supply
a direct current (d.c.) supply
a variable current (v.c) supply
a continuous current (c.c) supply
the pins of a 13 A plug are usually made from...
gold
aluminium
brass
copper
What is the potential difference of mains electricity?
320 V
230 V
100 V
430 V
What is the frequency of mains electricity?
50 KHz
250Hz
50 Hz
150 Hz
what colour is the casing of the neutral wire?
red
blue
brown
green and yellow
power is defined as...
the strength of the current
the rate of energy transfer
energy transferred per Coulomb of charge
the ratio of potential difference across a component to the current through it.
what does it mean if an appliance is energy efficient?
It doesn't waste any energy
It doesn't use much energy
It wastes a low proportion of its input energy
It wastes a large proportion of its input energy
A fan has a power rating of 0.08 kW. It is switched on for 8 hours a day.
Assuming that one month is 30 days, how much energy does the fan convert in one month? Give your answer in kWh.
0.64 kWh
2.4 kWh
19.2 kWh
24 kWh
A computer has a power rating of 150 W.
If it is switched on for 5 hours a day, how much energy does the computer convert in one day?
0.75 kWh
30 kWh
750 kWh
LED lamps are much more efficient than filament lamps.
What does this statement mean?
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.
