The voltage (potential difference) across a length of wire is 1.5 V - Edexcel - GCSE Physics - Question 8 - 2023 - Paper 2
Question 8
The voltage (potential difference) across a length of wire is 1.5 V.
A charge of 0.042 C flows through the wire.
Calculate the energy transferred.
Use the equatio... show full transcript
Worked Solution & Example Answer:The voltage (potential difference) across a length of wire is 1.5 V - Edexcel - GCSE Physics - Question 8 - 2023 - Paper 2
Step 1
Calculate the energy transferred.
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Answer
To calculate the energy transferred, we can use the formula:
E=Q×V
Substituting the values:
E=0.042imes1.5
Calculating gives:
E=0.063extJ
Thus, the energy transferred is 0.063 J.
Step 2
Add connecting wires, a voltmeter and an ammeter.
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Answer
The voltmeter should be connected in parallel with the iron wire to measure the voltage across it, while the ammeter should be connected in series with the iron wire to measure the current. The diagram should show the connections appropriately, ensuring that the symbols for both devices are included.
Step 3
Draw a straight line of best fit.
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Answer
A straight line of best fit should be drawn on Figure 21, ideally passing through the center of the data points to represent the relationship observed in the experiment.
Step 4
Use Figure 21 to estimate the resistance of a 100 cm length of the iron wire.
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Answer
By referencing Figure 21, find the corresponding resistance value for a 100 cm length of iron wire. Read the value at the 100 cm mark and note that it may be approximately in the range of the measured values represented in the graph.
Step 5
Calculate the resistance of this piece of wire.
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Answer
Using the equation:
V=I×R
We can rearrange this to find resistance:
R=IV
Substituting in the known values:
Voltage, V = 1.56 V
Current, I = 0.45 A
Calculating gives:
R=0.451.56=3.47extΩ
Therefore, the resistance of the piece of wire is approximately 3.47 Ω.
