Q2 of 330 Page 58

Which one has a higher electrical resistance: a 100-watt bulb or a 60 watt bulb?

As we know that


P is inversely proportional to resistance, so 60 watt has a higher electrical resistance.


More from this chapter

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18

The figure below shows a variable resistor in a dimmer switch.


How would you turn the switch to make the lights:


(a) brighter, and


(b) dimmer?


Explain your answer.

 1

State two factors on which the electrical energy consumed by an electrical appliance depends.

 3

Name the commercial unit of electric energy.

 4

An electric bulb is rated at 220 V, 100 W. What is its resistance?