Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 138

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A resistance $R$ whose value is varied from $1 Ω$ to $5 Ω$ is connected to a cell of internal resistance $3 Ω$ . The power consumed by $R$

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Important Questions on Electric Current Through Conductors

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 139

Two electric bulbs, each designed to operate with a power of $500 W$ in $220 V$ lines are put in series in a $110 V$ . What will be the power generated by each bulb?

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 140

An electric heater is rated

1500 W

. Electric power costs

₹ 2

per

kW h

. Then, the cost of power for

10 h

running time is,

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 141

A given conductor carrying a current

I A

produces an amount of heat equal to

2000 J

. If the current through the conductor is doubled, the amount of heat produced will be,

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 142

How many

100 W

bulbs may be safely used on a

220 V

supply with

5 A

fuse?

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 143

How many electrons flow per second through an electric bulb rated

220 V, 100 W

?

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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 144

In the circuit shown in the figure, the heat produced in the

5 Ω

resistor due to the current flowing through it is

10 c a l s^{- 1}

. The heat generated in the

4 Ω

resistor is,
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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 145

The resistance in which the maximum heat is produced is given by (figure)
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Physics Crash Course MHT-CET>Chapter 14 - Electric Current Through Conductors>Exercise 1>Q 146

A

100 W

bulb designed to operate on

100 V

is connected across a

500 V

source. Find the resistance to put in series so that bulb consumes

100 W

only.