|
1. Explain what is meant by a hairdryer with a power of 1.5
kW.
2. The electricity
meter's reading last month was 02586 kWh. This month's reading is 03102 kWh.
The electricity company charges 9 pence per kilowatt hour. What is the cost
of the electrical
energy used?
3. How
Science Works
A student investigated
the cost of electricity of different electrical appliances.
What do you think the control variable was?
4. Complete
the following table to find the cost of using the following appliances.
The cost is 9
pence per kWh.
| Devices |
Power |
Time |
Cost |
| Electric
cooker |
5 kW |
2
hours |
|
| Light
bulb |
100 W |
2 hours |
|
| Computer |
120 W |
30
minutes |
|
| Kettle |
2 kW |
15 minutes |
|
5. Higher tier only:
A panel of solar cells has a maximum output of 25 Watt. On average, over 24 hours, it produces
1/5 of its maximum output.
How many kilowatt-hours of electricity does the panel produce each day?
|
