UNIT Sample readings
Use your own results if possible, but if not make use of these
sample readings
Mass of water being heated = 100 g
Starting temperature of cold water = 22°C
Steady current I through heater = 1.5 A
Steady p. d. V across heater = 12.0V
Total time t of heating = 10 min = 600 s
Final temperature of warm water = 47°C

Analysing the readings

1. What is the power of the heater (in watts)?
2. How many joules of heat energy did the heater supply in total?
3. Through how many degrees C did this energy warm the
100 g of water?
4. How much energy, therefore, was needed to warm 1 kg of
water by 1°C?

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