Question

Answer question numbered 3(a) -
3(d) on the basis of your understanding of the following paragraph and the related studied concepts.Electric heating is a process in which Common applications include space processes. An electric heater is a
heat. Electric heater is generally
when electric current is passed through it. Electric heater is an application of heater, one is natural convection-based
process in which electrical energy is converted to heat energy.
Applications include space heating, cooking, water heating and industrial electric heater is an electrical device that converts an electric current into heat. Electric
heater is generally used in winter in India. It has coil which gets heated when an electric current is passed through it. Electric heater is an application of heating effect of electric current. It warms the room. There are two types of electric heater, one is natural convection-based heater and other is forced convection-based heater. In natural convection-based heater, flow of heated air takes place due change in density of the fluid. Whereas, in forced convection heater, a fan or blower is used with conventional type of heater.
(a)Which law is the basis for heating effect of current?
(b)If the resistance of the heating coil is 30 ohms. Find the heating effect produced if a current of 20 A is passed through it for 1 minute?
(c) There is a graph below depicting Ohm's law. What would be the change in slope of the line if resistance is increased.
(d) Define Convection. What are the other modes of heat transfer?
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Answer 1

Answer:

Explanation:

(a) Joules law of heating is basis for heating effect of current.

(b) Heat evolved is 720000 joules.

(c) Well the slope will decrease, with increase in resistance Voltage is increased and current is reduced so New graph will make a smaller angle than the previous one thus it's slope will decrease.

(d) In natural convention:-  flow of heated air takes place due change in density of the fluid.

In forced convection heater:-  a fan or blower is used with conventional type of heater.