A hair dryer has a power rating of \(920 W\). It is operated from the mains supply. (You should know that the mainsThe name given to the electricity from a wall socket. Eg: The mains voltage is 230V. supply is \(230 V\)). Work out the answers to the following questions.
Question
Calculate how much energy is transferred when the hair dryer is used for 2 minutes.
To calculate how much energy is transferred you need to take the following steps:
\(E = Pt\)
\(E = 920 \times (2 \times 60)\) (remember to convert time into seconds)
\(E = 110400J\)
Question
Calculate the current in the hair dryer when operating.
To calculate the current, you need to take the following steps:
\(P = IV\)
\(920 = I \times 230\)
\(I = \frac{{920}}{{230}}\)
\(I = 4A\)
Question
Calculate the resistance of the hair dryer.
To calculate the resistance, you need to take the following steps: