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Figure 4 shows the inside of a mains plug - Edexcel - GCSE Physics - Question 2 - 2020 - Paper 1

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Figure 4 shows the inside of a mains plug. The mains plug has three safety features. One of these safety features has been ticked in the table. Put two more ticks i... show full transcript

Worked Solution & Example Answer:Figure 4 shows the inside of a mains plug - Edexcel - GCSE Physics - Question 2 - 2020 - Paper 1

Step 1

Put two more ticks in the table to show the other two safety features.

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Answer

The other two safety features of the mains plug are the fuse and the live wire. Therefore, the completed table is as follows:

part of plugsafety feature
cable grip✓
earth wire
fuse✓
live wire✓
neutral wire

Step 2

The meter on the battery charger is

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Answer

A an ammeter.

Step 3

Calculate the charge flowing to the battery in 8 minutes.

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Answer

To calculate the charge, we use the equation:

charge=current×timecharge = current \times time

The current supplied is 2.5 A, and the time is 8 minutes, which we convert to seconds:

8 ext{ minutes} = 8 imes 60 = 480 ext{ seconds}.

Now substitute the values:

charge=2.5imes480=1200extCcharge = 2.5 imes 480 = 1200 ext{ C}

Thus, the charge flowing to the battery is 1200 Coulombs.

Step 4

Calculate the current in the primary coil.

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Answer

Using the equation:

primary current=secondary voltage×secondary currentprimary voltageprimary \ current = \frac{secondary \ voltage \times secondary \ current}{primary \ voltage}

Substituting the given values:

primary current=15×3.1230primary \ current = \frac{15 \times 3.1}{230}

This evaluates to:

primary current=46.5230=0.20217...≈0.20extA.primary \ current = \frac{46.5}{230} = 0.20217... \approx 0.20 ext{ A}.

Therefore, the current in the primary coil is approximately 0.20 A.

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