An electric patio heater contains three heating elements.
Figure 1 shows the circuit diagram for the heating elements in the heater.
In Figure 1, the heating elements are represented by resistor symbols.
Complete the sentence:
The three resistors representing the heating elements are connected in ___________ with the power supply.
Which switch must always be closed for the heater to work at all?
- SAS_ASA
- SBS_BSB
- SCS_CSC
Which switches must be closed for the heater to work at maximum power output?
- SAS_ASA and SBS_BSB
- SAS_ASA and SCS_CSC
- SAS_ASA, SBS_BSB and SCS_CSC
Write down the equation which links energy transferred (EEE), power (PPP) and time (ttt).
The heating elements have a maximum power output of 1600 W1600\text{ W}1600 W.
The energy transferred to the heating elements to reach normal operating temperature is 8000 J8000\text{ J}8000 J.
Calculate the time taken for the heating elements to reach normal operating temperature at maximum power output.
The heater uses a thermistor to monitor temperature.
Which description represents the circuit symbol for a thermistor?
- A: A circle with a cross inside
- B: A circle containing a triangle next to a vertical line, with two outward arrows
- C: A rectangle with a diagonal line that has a horizontal flat section at the lower end
- D: A rectangle with a diagonal arrow running through it
Current, potential difference and resistance Questions
Practise AQA GCSE Physics Current, potential difference and resistance with exam-style questions for Foundation and Higher tier. 82 questions covering Standard circuit diagram symbols, Electrical charge and current, Current, resistance and potential difference, and Resistors, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.