Energy Efficiency Quiz

What is the efficiency of the solar cells used in the solar powered device to recharge a mobile phone as shown in the diagram?

• 0.15

• 0.40

• 0.60

• 1.00

How much electrical energy do the solar cells produce each second?

• 0.15 joules

• 0.40 joules

• 0.60 joules

• 1.00 joules

Why is it important to confirm the efficiency of a new type of solar cell independently?

• To ensure the solar cell meets safety standards

• To verify the claimed efficiency by unbiased sources

• To increase the production of solar cells

• To reduce the cost of solar cells

What is the average energy output per day from a one square metre panel of solar cells, according to the information provided?

• 0.75 kWh

• 5 kWh

• 10 kWh

• 15 kWh

What is the efficiency of the solar cells used in the village in India for powering water pumps?

• 0.05

• 0.10

• 0.15

• 0.20

How much energy does each solar water pump use per day?

• 0.5 kWh

• 1.0 kWh

• 1.5 kWh

• 2.0 kWh

What is the power input in watts for a Compact Fluorescent Lamp (CFL)?

• 5 watts

• 8 watts

• 10 watts

• 12 watts

What is the efficiency of a Light Emitting Diode (LED) bulb?

• 10%

• 15%

• 20%

• 25%

How long is the lifetime in hours of a Light Emitting Diode (LED) bulb?

• 10,000 hours

• 25,000 hours

• 50,000 hours

• 75,000 hours

What is the cost of one Compact Fluorescent Lamp (CFL) bulb?

• £3.10

• £10.00

• £20.00

• £29.85