Q25 of 31 Page 252

How can you appreciate the role of a small fuse in house wring circuit in preventing damage to various electrical appliances connected in the circuit?

Electric fuses are connected in household circuits to prevent damages due to overloading. It is a thin wire with low melting point, when current flow exceeds the limit the fuse wire gets heated up and melts. Thus circuit breaks and current flow stops. Thus appliances and household wiring are saved from being damaged.


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23

Measure the resistance of a bulb (filament) in open circuit with a multi-meter. Make a circuit with elements such as a bulb, a battery of 12V and key in series. Close the key. Then again measure the resistance of the same bulb (filament) every 30 seconds. Record the observations in a proper table. What can you conclude from the above results?

 24

Draw a circuit diagram for a circuit in which two resistors A and B are connected in series with a battery and a voltmeter is connected to measure the potential difference across the resistor A.

 26

In the figure Q-26 the potential at A is ________ when the potential at B is zero.

 27

Observe the circuit and answer the questions given below.


i Are resistors 3 and 4 in series?


ii. Are resistors 1 and 2 in series


iii. Is the battery in series with any resistor?


iv. What is the potential drop across the resistor 3?


v. What is the total emf in the circuit if the potential drop across resistor 1 is 6V?