Learning Activity 7 20 minutes Answer the following questions on the spaces provided. 1. An electric kettle is rated at 1.44kW. It uses a voltage of 240V to boil water. (a) How much energy does the kettle use in one minute of operation? (b) How much current does the kettle draw when at full power? (c) What is the resistance of the kettle?

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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19:21
46 ll
Total resistance in this circuit:
R = 2k0 + 2500
R; = 20000 + 2500 = 22500
Total current in this circuit is
1, =
R,
450V
= 0.2A
22500
(b) We can now work out the power dissipated by each resistor.
In the 2ka resistor, the power dissipated is
P = P'R
P-0.2° x 20000 - 80w
In the 250W resistor, the power dissipated is
P= 'R
P-0.2 x 2500 - 10w
(c)
The total power dissipated is 80W + 10W = 90w
Now check what you have just learnt by trying out the learning activity on the next page!
61
GR 11 PHYS M5
ELECTRICITY PRINCIPLES
Learning Activity 7
20 minutes
Answer the following questions on the spaces provided.
1.
An electric kettle is rated at 1.44kW. It uses a voltage of 240V to boil water.
(a) How much energy does the kettle use in one minute of operation?
(b)
How much current does the kettle draw when at full power?
(c) What is the resistance of the kettle?
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Transcribed Image Text:19:21 46 ll Total resistance in this circuit: R = 2k0 + 2500 R; = 20000 + 2500 = 22500 Total current in this circuit is 1, = R, 450V = 0.2A 22500 (b) We can now work out the power dissipated by each resistor. In the 2ka resistor, the power dissipated is P = P'R P-0.2° x 20000 - 80w In the 250W resistor, the power dissipated is P= 'R P-0.2 x 2500 - 10w (c) The total power dissipated is 80W + 10W = 90w Now check what you have just learnt by trying out the learning activity on the next page! 61 GR 11 PHYS M5 ELECTRICITY PRINCIPLES Learning Activity 7 20 minutes Answer the following questions on the spaces provided. 1. An electric kettle is rated at 1.44kW. It uses a voltage of 240V to boil water. (a) How much energy does the kettle use in one minute of operation? (b) How much current does the kettle draw when at full power? (c) What is the resistance of the kettle? Access Content From Anywhere, O Browse Securely, and Protect Your x Privacy With ExpressVPN. Open
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