18 20 A student uses an electric heater to raise the temperature of water. Fig. 20.1 shows some of the equipment the student uses. 8 Low voltage power supply Electric heater Water Beaker Fig. 20.1 The student obtains the data in Table 20.1: Energy input to the heater 12000 J Increase in thermal energy store of the water 8400 J Table 20.1 (a) Use the data in Table 20.1 to calculate the efficiency of the heater. Efficiency = [3]

18 20 A student uses an electric heater to raise the temperature of water. Fig. 20.1 shows some of the equipment the student uses. 8 Low voltage power supply Electric heater Water Beaker Fig. 20.1 The student obtains the data in Table 20.1: Energy input to the heater 12000 J Increase in thermal energy store of the water 8400 J Table 20.1 (a) Use the data in Table 20.1 to calculate the efficiency of the heater. Efficiency = [3]

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter20: Electric Current, Resistance, And Ohm's Law

Section: Chapter Questions

Problem 68PE: Integrated Concepts (a) What is the cost of heating a hot tub containing 1500 kg of water from...

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