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Several electric bulbs designed to be used on a \(220\ V\) electric supply line, are rated \(10\ W\). How many lamps can be connected in parallel with each other across the two wires of \(220\ V\) line if the maximum allowable current is \(5\ A\)?
 
The resistance (\(R\)) of the bulb can be calculated using the formula
R1=iiii
 
On substituting the known values, we get  \(\Omega\).
 
From the Ohm's law, the formula of resistance is given as
 
R=ii
 
On substituting the known values, we get  \(\Omega\).
 
Let \(x\) number of bulbs to be connected in parallel to obtain a resistance \(R\).
 
R=iii
 
By simplifying and substituting the known values in the above formula, we get  lamps.