Complete the sentence by putting a cross (✗) in the box next to your answer - Edexcel - GCSE Physics - Question 3 - 2017 - Paper 1
Question 3
Complete the sentence by putting a cross (✗) in the box next to your answer.
The unit of potential difference is the
☐ A amp
☐ B joule
☐ C volt
☐ D watt
(b) Choos... show full transcript
Worked Solution & Example Answer:Complete the sentence by putting a cross (✗) in the box next to your answer - Edexcel - GCSE Physics - Question 3 - 2017 - Paper 1
Step 1
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
The unit of potential difference is the C volt.
Step 2
Choose words from the box to complete the sentence.
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Answer
Electrical energy is transmitted at high voltages,
because it improves the efficiency by reducing
heat loss in the transmission lines.
Step 3
Calculate the input power of the transformer.
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Answer
To calculate the input power of the transformer, use the formula:
P=VimesI
Substituting the values:
P=12extVimes0.5extA
Evaluating gives:
P=6extW
Thus, the input power of the transformer is 6 and the unit is W.
