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Physics problems: electricity

equivalent resistance:

 

parallel and series connections

 

Problem 48.

Ten bulbs are connected in a series circuit to a power supply line.
Ten identical bulbs are connected in a parallel circuit to an identical power supply line.
1. Which circuit would have the highest voltage across each bulb?
2. In which circuit would the bulbs be brighter?
3. In which circuit, if one bulb blows out, all others will stop glowing?
4. Which circuit would have less current in it?

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 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

 

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

 

 

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