Figure 5 shows part of a lighting circuit in a house - AQA - GCSE Physics - Question 3 - 2020 - Paper 1
Question 3
Figure 5 shows part of a lighting circuit in a house.
Figure 5
What is the frequency of the ac mains electricity supply in the UK?
Tick (✓) one box.
20 Hz
50 Hz
60... show full transcript
Worked Solution & Example Answer:Figure 5 shows part of a lighting circuit in a house - AQA - GCSE Physics - Question 3 - 2020 - Paper 1
Step 1
What is the frequency of the ac mains electricity supply in the UK?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The frequency of the AC mains electricity supply in the UK is 50 Hz.
Step 2
Which diagram shows an alternating potential difference?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The diagram that shows an alternating potential difference is the second diagram (labeled with the oscillating waveform).
Step 3
Calculate the power output of the lamp.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To calculate the power output of the lamp, we use the formula:
power=potentialdifference×current
Substituting the given values:
power=230V×0.020A=4.6W
Therefore, the power output of the lamp is 4.6 W.
Step 4
Calculate the energy transferred by the lamp when 180 C of charge flows through the lamp.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To calculate the energy transferred, we use the formula:
energytransferred=chargeflow×potentialdifference
Substituting the values:
energytransferred=180C×230V=41,400J
Therefore, the energy transferred by the lamp is 41,400 J.
Step 5
Describe the possible hazard and the risk to the electrician of changing the light switch.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Hazard: The hazard is the live wire or high potential difference present in the circuit.
Risk: The risk to the electrician includes the possibility of electric shock or electrocution, which can lead to serious injury or death.
