The a.c. generator: past paper questions
Real questions on the a.c. generator
The newest 13 of 13 written questions. Open one to see it on the real paper.
- 0625/42 · May/June 2024 · Q5c[2]
Internet data can be transferred using infrared waves in optical fibres. State two advantages of using optical fibres to transmit data. ,
See it on the paper → - 0625/43 · October/November 2022 · Q3a[3]
Complete the sentences to describe the energy transfers which take place when the gates are opened. Use words from the list. tidal bay kinetic open sea turbines gates gravitational potential water energy of the in the is transferred to energy in the rotating . This energy is used in the generator to produce electrical...
See it on the paper → - 0625/43 · October/November 2022 · Q3b[2]
State one advantage and one disadvantage of tidal power as an energy resource. advantage disadvantage
See it on the paper → - 0625/43 · October/November 2022 · Q3c[1]
State the main source of energy for tidal energy.
See it on the paper → - 0625/43 · October/November 2022 · Q9a[2]
Calculate the time period (time for one complete cycle) of the a.c. supply. time =
See it on the paper → - 0625/43 · October/November 2022 · Q9b(i)[3]
sketch a graph to show how the p.d. across the resistor varies with time for two cycles
See it on the paper → - 0625/43 · October/November 2022 · Q9b(ii)[1]
label the p.d. axis with the value of p.d. at the peak
See it on the paper → - 0625/43 · October/November 2022 · Q9b(iii)[2]
label the time axis with two values of time.
See it on the paper → - 0625/41 · May/June 2019 · Q7c(ii)[2]
the ammeter reading. reading =
See it on the paper → - 0625/41 · May/June 2019 · Q7d[2]
The temperature of component X increases. State and explain what happens to the ammeter reading.
See it on the paper → - 0625/41 · May/June 2019 · Q8a(i)[3]
Explain why rotating the coil produces an output voltage.
See it on the paper → - 0625/41 · May/June 2019 · Q8a(ii)[2]
State the position of the rotating coil when the alternating output voltage is at a maximum value and explain why the maximum output occurs at this position.
See it on the paper → - 0625/41 · May/June 2019 · Q8b[3]
A lamp and an open switch are connected in series to the output terminals of the a.c. generator. The switch is closed and the lamp lights up. The student has to apply a greater force on the handle. Explain why a greater force is needed to keep the lamp lit.
See it on the paper →
What examiners said
Most candidates could correctly state at least one advantage of using infrared waves in optical fibres to transmit data. Vague answers such as being cheaper, more efficient and accurate were not sufficient for credit and if there was a reference to transparency of the fibres it needed to be transparent to infrared.
— Examiner report, May/June 2024, 0625/42 Q5(c) (Cambridge)
This was answered very well with most candidates gaining full credit. The most common mistake was to use open sea in place of tidal (bay).
— Examiner report, October/November 2022, 0625/43 Q3(a) (Cambridge)
There were many varied correct advantages and disadvantages given by the candidates. The most common correct answers for an advantage were “renewable” and “doesn’t produce gas pollution”. The question asked for advantages and disadvantages specific to tidal power. Some answers, such as being eco-friendly, were too vague and general to gain credit. For example, “expensive to build” was required rat...
— Examiner report, October/November 2022, 0625/43 Q3(b) (Cambridge)
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