Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 69

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Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature, $100 W, 60 W$ and $40 W$ bulbs have filament resistances $R_{100}, R_{60}$ and $R_{40}$ , respectively, the relation between these resistances is

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Important Questions on Current Electricity

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 70

An electric bulb is rated

220 V - 100 W

. The power consumed by it when operated on

110 V

will be

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 71

A current of

2 A

, passing through a conductor produces

80 J

of heat in

10 seconds

. The resistance of the conductor in ohm is

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 72

Two resistances, a

60 Ω

and an unknown one are connected to a power source in a series arrangement. Power of the unknown resistance is

60 W

. What is the voltage of the power source at the least ?

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 73

If an electric kettle marked

500 W

,

220 V

takes

15 m i n

to boil

1 k g

of water from

10 ° C

then the efficiency of kettle is-

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 74

In the circuit, shown in the figure, $V$ must be

Question Image

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 75

A uniform wire of resistance

R

and length

L

is cut into four equal parts, each of length

\frac{L}{4}

, which are then connected in parallel combination. The effective resistance of the combination will be

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 76

A metallic wire of resistance

12 Ω

is bent to from a square. The resistance between two diagonal points would be

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Achieve CUET (UG) Physics Practice Book>Chapter 3 - Current Electricity>Exercise>Q 77

By using only two resistance coils-singly, in series or in parallel, one should be able to obtain resistance of

3

,

4

,

12

and

16

ohms. The separate resistances of the coil are