Question

3. Paheli mok aware of length 10 cm Boojho took a wire of 5 cm of the same material and thickness, Boch of them connected the wires as shown in the circuit given in the figure. The current flowing in both circuits

is the same.

10 cm

5 cm

A

B

a) Will the heat produced in both the cines be equal? Explain.

b) Will the heat produced be the same if the wires taken by them are of equal lengths but of different thickness Explain.

4. Sarita saw her mother running microwave oven, electric cooker and mixer grinder from a single socket. She immediately rushed to her mother and reminded her of overloading and its consequences. Sarita's mother inunediately turned off the switch and connected them one by one according to her need

a) What is overloading?

by What are the consequences of overloading?

e) What mile do MCB play in case of overloading?​

Answer 1

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Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit given in Figure 14.4. The current flowing in both the circuits is the same.

i) Will the heat produced in both the cases be equal? Explain.

ii) Will, the heat produced be the same if the wires taken by them are of equal lengths but of different thickness? Explain.

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Solution

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i) Total sum of heat produced in the respective wire depends upon the length (end to end distance) of the wire. So, the total sum of heat produced in both cases will not be equal.

ii) No. Thickness or width of the respective wire decides the total sum of heat produced by the wire.

ans 4No, the amount of heat produced in the wire depends upon the thickness of the

Fuse protects circuits and appliances by stopping the flow of any unduly high electric current. The fuse is placed in series with the device. It consists of a piece of wire made of a metal or an alloy of appropriate melting point, for example aluminium, copper, iron, lead etc. If a current larger than the specified value flows through the circuit, the temperature of the fuse wire increases. This melts the fuse wire and breaks the circuit.

In the above mentioned case the electrician must have noticed that the fuse has burnt due to overheating as large amount of current has flown through it.