Question

How much power is produced if a voltage of `15 V` is applied to a circuit with a resistance of `5 Omega`?

Answer 1

Power is `45` `W`

Explanation:

`"Current in this circuit" = "voltage"/ "resistance"`
i.e. `I =V/R`

so `I= 15/5` = `3` `A`

Power= `"voltage" xx "current"` i.e. `P = V.I` = `15 xx 3` = `45 W`.
Or `I^2 xx R` = `3xx3 xx5` = `45` `W`.

where `V`=voltage `I`= current `R`= Resistance .