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An industrial air-drying unit contains three high-power heating elements.

Figure 1 shows the electrical schematic diagram for these heating elements.

In Figure 1, the heating elements are represented by standard resistor symbols.

Industrial Air-Drying Unit Circuit

Complete the sentence:

The three resistors representing the heating elements are connected in ____________ with each other across the power supply.

[1]

Which switch must always be closed for any of the heating elements to work?

$S_1$
$S_2$
$S_3$

[1]

Which switches must be closed for the heating system to operate at maximum power output?

$S_1$ and $S_2$
$S_1$ and $S_3$
$S_1$ , $S_2$ and $S_3$

[1]

Write down the equation which links energy transferred ( $E$ ), power ( $P$ ) and time ( $t$ ).

[1]

The heating elements have a maximum combined power output of $W2500\text{ W}$ .

The energy transferred to the heating elements to reach their standard operating temperature is $J35\,000\text{ J}$ .

Calculate the time taken for the heating elements to reach their standard operating temperature at maximum power output.

[2]

The control panel of the unit uses a light-emitting diode (LED) as a status indicator.

Which description represents the standard circuit symbol for an LED?

A: A circle with a cross inside
B: A rectangle with a diagonal arrow running through it
C: A circle containing a triangle touching a vertical line, with two arrows pointing away
D: A rectangle with a diagonal line that has a flat horizontal section at the lower end

[1]

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.