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Physics problems: electricity

Part 7

 

Problem 61.

A wire of resistance R is cut into five equal pieces. These five pieces of wire are then connected in parallel. What is the equivalent resistance of this combination in terms of the original resistance R?

Solution

 

Problem 62.

A copper wire has a diameter of 0.5 mm and resistivity of resistivity. What will be the length of this wire to make its resistance of 2 ohm?

Solution

 

Problem 63.

How does the resistance of a wire change when
1. Its length is tripled?
2. Its diameter is tripled?
3. Its material is changed to one whose resistivity is three times?

Solution

 

Problem 64.

How much energy is given to a charge of 20 nC passing through a 6 V battery?

Solution

 

Problem 65.

The potential difference between the terminals of an electric iron is 240 V and the current is 5.0 A. What is the resistance of the electric iron?

Solution

 

 

 

Problem 66.

A potential difference of 20 volts is applied across the ends of a resistance of 5 ohms. What current will flow in the resistance?

Solution

 

Problem 67.

A current of 5 amperes flows through a wire whose ends are at a potential difference of 3 volts. Calculate the resistance of the wire.

Solution

 

Problem 68.

What is the potential difference (voltage) between the ends of a conductor of 16 ohm resistance, when a current of 1.5 A flows through it?

Solution

 

Problem 69.

An electric bulb draws a current of 0.35 A for 20 minutes. Calculate the amount of electric charge that flows through the circuit.

Solution

 

 

 

 

 

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