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Question 21M.2.SL.TZ1.3d.i

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.2.SL.TZ1.3d.i
Level SL Paper 2 Time zone TZ1
Command term Show that Question number d.i Adapted from N/A
d.i.
[Maximum mark: 1]
21M.2.SL.TZ1.3d.i

A mass of 1.0 kg of water is brought to its boiling point of 100 °C using an electric heater of power 1.6 kW.

The electric heater has two identical resistors connected in parallel.

The circuit transfers 1.6 kW when switch A only is closed. The external voltage is 220 V.

(d.i)

Show that each resistor has a resistance of about 30 Ω.

[1]

Markscheme

P=v2R so 22021600 so R=30.25 «Ω» ✓

Must see either the substituted values OR a value for R to at least three s.f.

 

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