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Physics problems: electricity

Part 6

 

Problem 51.

An electric bulb is connected to a 220 V power supply line. If the bulb draws a current of 0.5 A, calculate the power of the bulb.

Solution

 

Problem 52.

In which of the following cases more electrical energy is consumed per hour?

Case 1. A current of 1 ampere passed through a resistance of 300 ohms

Case 2. A current of 2 amperes passed through a resistance of 100 ohms. 

Solution

 

Problem 53.

In a house two 60 W electric bulbs are lighted for 4 hours, and three 100 W bulbs for 5 hours every day. Calculate the electric energy consumed in 30 days.

Solution

 

Problem 54.

If the potential difference between the ends of a wire of fixed resistance is doubled, by how much does the electric power increase?

Solution

 

Problem 55.

Which uses more energy: a 250 W TV set in 1 hour or a 1200 W Toaster in 10 minutes?

Solution

 

 

 

Problem 56.

An electric bulb is rated as 10 W, 220 V. How many of these bulbs can be connected in parallel across the two wires of 220 V supply line if the maximum current which can be drawn is 5 A.

Solution

 

Problem 57.

How much work is done in moving a charge of 2 coulombs from a point at 118 volts to a point at 128 volts?

Solution

 

Problem 58.

What possible values of resultant resistance one can get by combining two resistances, one of value 2 ohm and the other 6 ohm?

Solution

 

Problem 59.

Four resistances of 16 ohms each are connected in parallel. Four such combinations are connected in series. What is the total resistance? 

Solution

 

Problem 60.

How will you connect three resistors of 2 ohm, 3 ohm and 5 ohm respectively so as to obtain a resultant resistance of 2.5 ohm? Draw the diagram to show the arrangement. 

Solution

 

 

 

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