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level: Electrical Power

Questions and Answers List

level questions: Electrical Power

QuestionAnswer
what is considered a powerful object in physicsan object that gets work done quickly
what is power?the rate at which energy is transferred in Watts energy transferred per unit time
What is one Watt equivalent to?1 Joule of energy transferred in 1 second
what is the formula for power when given an energy and a timeP=E/t
do high power appliances ( those that transsform electrical energy to produce heat and consume power) draw a large or little current?large current
what are the four relationships for calculating power?P=E/t P=IV P=I^2R P= V^2/R
What is a fuse?A safety device used to protect the flex of an appliance or the wiring of a circuit
what will happen if too much current flows through a fuse?insulated surrounding copper wire may melt, which leads to exposed wires
what are fuses typically made from?short lengths of wire which melt if current exceeds a certain value. This value is determined by the wire type or thickness
what two current ratings to UK fuses usually come with?3A or 13A
how do you ensure you select the right fuseyou must know an appliances power, with this you need to calculate the appliances current (assuming it is plugged into 230V mains) with P=IV. The fuse must be large enouigh to allow the appliance to work normally.