GCSE AQA Physics Changes of State & the Particle Model: Figure 2 shows part of the Natio

Question

Figure 2 shows part of the National Grid linking a power station to consumers.

Figure 2

A

B

Consumers

Power station

Step-up transformer

1. Name the parts of Figure 2 labelled A and B.

A

B

2. Electricity is transmitted through A at a very high potential difference.

What is the advantage of transmitting electricity at a very high potential difference?

Tick (✓) one box.

A high potential difference is safer for consumers.

Less thermal energy is transferred to the surroundings.

Power transmission is faster.

3. The power station generates electricity at a potential difference of 25 000 V.

The energy transferred by the power station in one second is 500 000 000 J.

Calculate the charge flow from the power station in one second.

Use the equation:

charge flow = $ \frac{energy}{potential \, difference} $

4. Calculate the total power of all the appliances in Table 1.

Use the equation:

power = potential difference × current

5. Each appliance in Table 1 is switched on for 2 hours.

Which appliance will transfer the most energy?

Give a reason for your answer.

Appliance

Reason

6. The average energy transferred from the National Grid every second for each person in the UK is 600 J.

There are 32 000 000 seconds in one year.

Calculate the average energy transferred each year from the National Grid for each person in the UK.

Figure 2 shows part of the National Grid linking a power station to consumers - AQA - GCSE Physics - Question 2 - 2021 - Paper 1