5 (a) Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Physics - Question 5 - 2018 - Paper 1
Question 5
5 (a) Complete the sentence by putting a cross (X) in the box next to your answer.
An electric current is the rate of flow of
☐ A atoms
☐ B charge
☐ C molecules
☐ ... show full transcript
Worked Solution & Example Answer:5 (a) Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Physics - Question 5 - 2018 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The correct answer is B charge. An electric current is defined as the rate of flow of electric charge.
Step 2
Calculate the power.
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Answer
Power can be calculated using 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=230extVimes9.2extA=2116extW
Therefore, the power is 2116 W.
Step 3
Calculate the cost of using the computer for 4 hours.
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Answer
To find the cost of using the computer, use the following steps:
Calculate the total energy used in kilowatt-hours (kWh):
Energy (kWh) = Power (kW) × Time (hours)
The power of the computer is 350 W, which is 0.350 kW.
Energy = 0.350 kW × 4 hours = 1.4 kWh
Now, calculate the cost:
Cost = Energy (kWh) × Price per kWh
Cost = 1.4 kWh × 20 p = 28 p
Thus, the cost of using the computer for 4 hours is 28 p.
