Question

If the current passing through an electric bell is doubled, the heat produced will become

• A. four times
• B. double
• C. one-fourth
• D. half

Answer 1

The correct option is A four times

Answer is A.
Energy ($power\times time$) is measured in Joules and by including time (t) in the power formulae, the energy dissipated by a component or circuit can be calculated.
Energy dissipated = Pt or $VI\times tasP=VI$.
It can also be written as $I^2\times RtasV=IR.$
Hence, the expression for Power in terms of current is given as $P=I^{2}RtJ$.
Therefore, if I becomes 2I, then $P^{\prime }=(2{I)}^{2}R\times t=4(I^{2}R\times t)$.
Hence, if the current passing through an electric bell is doubled, the heat produced will become four times more.