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Science, Physics
9th -
10thgrade
Generating Electricity and Transformers
13 questions
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- 1. Multiple Choice
A transformer changes
energy
frequency
power
voltage
- 2. Multiple Choice
The core of the transformer is made of
copper
gold
iron
silver
- 3. Multiple Choice
In a fossil-fuel power station, the overall energy conversion is
chemical to heat
chemical to electrical
heat to kinetic
heat to electrical
- 4. Multiple Choice
Which of the following does a transformer work with?
Alternating current only
Direct current only
Both alternating current and direct current
- 5. Multiple Choice
Why is electricity transmitted at high voltages?
to reduce energy loss
to power more appliances
to be less dangerous to humans
to be less prone to fires
- 6. Multiple Choice
The input voltage in a transformer is 240,000V while the output voltage is 240V. What type of transformer is this?
Step Up Transformer
Step Down Transformer
- 7. Multiple Choice
What is the main source of electricity in Singapore?
coal
natural gas
solar
oil
- 8. Multiple Choice
There are LESSER number of coils in the primary coil of a transformer than in the secondary coil of a transformer. What type of transformer is it?
Step Up
Step Down
- 9. Multiple Choice
What is the normal voltage that is supplied to our homes in Singapore?
180 V
230 V
230,000V
400,000V
- 10. Multiple Choice
Which of the following is correct for process 1 after electricity is generated in power stations?
step down transformer
high power transmission line
step up transformer
- 11. Multiple Choice
What is part X made up of?
aluminium
copper
gold
iron
- 12. Multiple Choice
What type of transformer is this?
Step down
Step Up
- 13. Multiple Choice
What is the reason for fossil fuels in power stations?
to treat waste water
to convert water to electricity
to convert water to steam
to cool water
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