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An electric heater of resistance 8 draws 15A from the service

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Class 10

NCERT

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Which uses more energy, a 250 W TV set in 1 hr, or a 1200W toaster in 10 utes?

An electric heater of resistance

8 Ω

draws

15 A

from the service mains

2

hours. Calculate the rate at which heat is developed in the heater.

Explain the following.

(a) Why is the tungsten used almost exclusively for filament of electric lamps?

(b) Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?

(d) How does the resistance of a wire vary with its area of cross section?

(e) Why are copper and aluium wires usually employed for electricity transmission?

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Chapter 13: Magnetic Effects of Electric Current

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Question

Medium

Solving time: 3 mins

An electric heater of resistance $8 Ω$ draws $15 A$ from the service mains $2$ hours. Calculate the rate at which heat is developed in the heater.

Views: 6,114 students

Updated on: Feb 7, 2024

Book:

Science (NCERT)

Found 6 tutors discussing this question

Oliver Discussed

An electric heater of resistance

8 Ω

draws

15 A

from the service mains

2

hours. Calculate the rate at which heat is developed in the heater.

7 mins ago

Discuss this question LIVE

7 mins ago

Text solutionVerified

Rate of generating heat is equal to the power used by the heater.

By Joule's Law of heating,

P = I^{2} R

= 1 5^{2} \times 8

= 1800 W

Hence, rate of generation of heat is

1800 W

Total amount of heat generated,

E = Pt

E = 1800 \times 2 = 3.6 kWh

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Practice more questions from Science (NCERT)

Which uses more energy, a 250 W TV set in 1 hr, or a 1200W toaster in 10 utes?

An electric heater of resistance

8 Ω

draws

15 A

from the service mains

2

hours. Calculate the rate at which heat is developed in the heater.

Explain the following.

(a) Why is the tungsten used almost exclusively for filament of electric lamps?

(b) Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?

(d) How does the resistance of a wire vary with its area of cross section?

(e) Why are copper and aluium wires usually employed for electricity transmission?

View all

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Question Text	An electric heater of resistance $8 Ω$ draws $15 A$ from the service mains $2$ hours. Calculate the rate at which heat is developed in the heater.
Updated On	Feb 7, 2024
Topic	Electricity
Subject	Science
Class	Class 10
Answer Type	Text solution:1 Video solution: 6
Upvotes	849
Avg. Video Duration	5 min

An electric heater of resistance $8 Ω$ draws $15 A$ from the service mains $2$ hours. Calculate the rate at which heat is developed in the heater.

Text solutionVerified

Filo tutor solutions (6)

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