Show how you would connect three resistors, each of resistance 6, so that the combination has a resistance of (i) 9
, and (ii) 4
.
(i) In order to get a resistance of 9 from three resistors of 6
each, we connect two 6
resistors in parallel and then this parallel combination is connected in series with the third 6
resistor .
For parallel connection:
Or R= 3
And for series connection: R= 3 + 6
= 9
(ii) In order to get a resistance of 4 from three resistors of 6
each, we connect all the three 6
resistors in parallel:
Or R= 2
Then, Net Resistance R= 2+ 2
= 4
.
Several electric bulbs designed to be used on a 220 V electric supply line are rated 10 W each. How many bulbs can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A ?
(view answer)