Modern televisions use small amounts of power - Edexcel - GCSE Physics - Question 4 - 2012 - Paper 1
Question 4
Modern televisions use small amounts of power.
(a) Which of these describes power.
Put a cross (X) in the box next to your answer.
☐ A distance travelled per seco... show full transcript
Worked Solution & Example Answer:Modern televisions use small amounts of power - Edexcel - GCSE Physics - Question 4 - 2012 - Paper 1
Step 1
Which of these describes power.
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Answer
Power is defined as the rate of energy transfer or conversion. Thus, the correct answer is
☐ C energy transferred per second.
Step 2
Calculate the power consumption of the television when it is switched on.
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Answer
To calculate power consumption, we use the formula:
P=VimesI
where:
P is the power in watts (W)
V is the voltage in volts (V)
I is the current in amperes (A)
Substituting the values:
P=230extVimes0.25extAP=57.5extW
Therefore, rounding to the nearest whole number, the power consumption is
power consumption = 58 W.
Step 3
Describe what is meant by current.
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Answer
Current is the flow of electric charge. It is typically measured as the rate of flow of electrons or ions, usually expressed in amperes (A). In simpler terms, current represents the movement of electric charge per second.
