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P2: Quiz 14
P2: Quiz 14
1) Fill in the gaps in the sentence below.
The National Grid takes energy from where it has been _______ to anywhere that it is _______
2) Write down the equation that links potential difference, power and current. Give the units for each of the values as well.
3) In the National Grid, electricity travels along power line; describe the potential difference and current of the electricity as it travels along these power lines. Explain why the electricity has this potential difference and current.
4) There are two different types of transformers; a step-up transformer and a step-down transformer.
a) Describe what happens to the current and potential difference at a step-up transformer.
b) Describe what happens to the current and potential difference at a step-down transformer.
5) The diagram below shows what a transformer looks like.
The National Grid takes energy from where it has been _______ to anywhere that it is _______
2) Write down the equation that links potential difference, power and current. Give the units for each of the values as well.
3) In the National Grid, electricity travels along power line; describe the potential difference and current of the electricity as it travels along these power lines. Explain why the electricity has this potential difference and current.
4) There are two different types of transformers; a step-up transformer and a step-down transformer.
a) Describe what happens to the current and potential difference at a step-up transformer.
b) Describe what happens to the current and potential difference at a step-down transformer.
5) The diagram below shows what a transformer looks like.
a) For the above transformer, what is the name of the coil on the left?
b) For the above transformer, what is the name of the coil on the right?
c) What is the core of transformers made from?
The remaining questions in this quiz will use the equation below.
b) For the above transformer, what is the name of the coil on the right?
c) What is the core of transformers made from?
The remaining questions in this quiz will use the equation below.
6) The primary coil in a transformer has a potential difference of 240 V and a current of 0.5 A. The current in the secondary coil is 4 A.
a) Calculate the potential difference across the secondary coil.
b) Is the transformer a step-up or a step-down transformer. Explain your answer.
7) The primary coil in a transformer has a potential difference of 25,000 V and a current of 5 A. The potential difference in the secondary coil is 400,000 V.
a) Calculate the current in the secondary coil. Do not round your answer.
b) Is the transformer a step-up or a step-down transformer. Explain your answer.
8) The primary coil in a transformer has a current of 200 A and an unknown potential difference. The secondary coil in a transformer has a potential difference of 400,000 V and a current of 6 A. Calculate the potential difference in the primary coil.
a) Calculate the potential difference across the secondary coil.
b) Is the transformer a step-up or a step-down transformer. Explain your answer.
7) The primary coil in a transformer has a potential difference of 25,000 V and a current of 5 A. The potential difference in the secondary coil is 400,000 V.
a) Calculate the current in the secondary coil. Do not round your answer.
b) Is the transformer a step-up or a step-down transformer. Explain your answer.
8) The primary coil in a transformer has a current of 200 A and an unknown potential difference. The secondary coil in a transformer has a potential difference of 400,000 V and a current of 6 A. Calculate the potential difference in the primary coil.