Electrical Power A convection heater has two settings 1000W or 2000W. What is meant by a power rating of 2000W The convection heater uses the current flowing in a resistance wire to change electrical energy into heat. What is the relationship links the power rating of an appliance, the current flowing and its resistance. The convection heater operates at the mains voltage of 230V. At which of its settings does it draw the most current from the supply? Does the mains supply provide ac or dc current? A householder uses the convection heater at its lowest setting for 30 minutes which costs him 6p. How long could he operate the heater at its highest setting for the same cost?
Electrical Power A convection heater has two settings 1000W or 2000W. What is meant by a power rating of 2000W The convection heater uses the current flowing in a resistance wire to change electrical energy into heat. What is the relationship links the power rating of an appliance, the current flowing and its resistance. The convection heater operates at the mains voltage of 230V. At which of its settings does it draw the most current from the supply? Does the mains supply provide ac or dc current? A householder uses the convection heater at its lowest setting for 30 minutes which costs him 6p. How long could he operate the heater at its highest setting for the same cost?
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