1.

An electric iron of resistance 20 Omega takes a current of 5A. Calculate the heat developed in 30s.

Answer»

Solution :It is given that RESISTANCE of electric iron `R=20 Omega` current drawn by electric iron I=5A and time t=30s.
`THEREFORE` Heat GENERATED `H=I^2RT=(5)^2 times 20 times 30 =15000J`


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