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Example 3.1. The heater element of an electric kettle has a con- stant resistance of 100 Q and the applied voltage is 250 V. Calculate the time taken to raise the temperature of one litre of water from 15ºC to 90°C assuming that 85% of the power input to the kettle is usefully employed. If the water equivalent of the kettle is 100 g, find how long will it take to raise a second litre of water through the same tempera- ture range immediately after the first.

Example 3.1. The heater element of an electric kettle has a con- stant resistance of 100 Q and the applied voltage is 250 V. Calculate the time taken to raise the temperature of one litre of water from 15ºC to 90°C assuming that 85% of the power input to the kettle is usefully employed. If the water equivalent of the kettle is 100 g, find how long will it take to raise a second litre of water through the same tempera- ture range immediately after the first.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Example 3.1. The heater element of an electric kettle has a con- stant resistance of 100 Q and the applied voltage is 250 V. Calculate the time taken to raise the temperature of one litre of water from 15ºC to 90°C assuming that 85% of the power input to the kettle is usefully employed. If the water equivalent of the kettle is 100 g, find how long will it take to raise a second litre of water through the same tempera- ture range immediately after the first. 0g.
Transcribed Image Text:Example 3.1. The heater element of an electric kettle has a con- stant resistance of 100 Q and the applied voltage is 250 V. Calculate the time taken to raise the temperature of one litre of water from 15ºC to 90°C assuming that 85% of the power input to the kettle is usefully employed. If the water equivalent of the kettle is 100 g, find how long will it take to raise a second litre of water through the same tempera- ture range immediately after the first. 0g.
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