Find the best tutors and institutes for Class 10 Tuition
Search in
Why does the cord of an electric heater not glow while the heating element does?
The heating element of an electric heater is a resistor. The amount of heat produced by it is proportional to its resistance. The resistance of the element of an electric heater is very high. As current flows through the heating element, it becomes too warm and glows red. On the other hand, the resistance of the cord is low. It does not become red when current flows through it.
Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.
The amount of heat (H) produced is given by the Joule’s law of heating as
Where,
Voltage, V = 50 V
Time, t = 1 h = 1 × 60 × 60 s
Amount of current, 
Therefore, the heat generated is 
.
An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.
The amount of heat (H) produced is given by the joule’s law of heating as
Where,
Current, I = 5 A
Time, t = 30 s
Voltage, V = Current × Resistance = 5 × 20 = 100 V
Therefore, the amount of heat developed in the electric iron is
.
How helpful was it?
How can we Improve it?
Please tell us how it changed your life *
Please enter your feedback
UrbanPro.com helps you to connect with the best Class 10 Tuition in India. Post Your Requirement today and get connected.
Find best tutors for Class 10 Tuition Classes by posting a requirement.
Get started now, by booking a Free Demo Class
