EMF and PD

What does Electromotive force (EMF) refer to?

• The total energy supplied by a source

• The voltage lost in a circuit

• The resistance of a circuit

• The current in a circuit

Which statement best describes potential difference?

• It is the total voltage a battery can provide

• It is the voltage used between two points in a circuit

• It is always greater than EMF

• It does not affect current flow

Which equation correctly relates voltage, current, and power in an electric circuit?

• P=VI

• P=V/I

• P=I/V

• P=V+I

A household uses a 1,500-watt air conditioner for 4 hours per day. If electricity costs ₱10 per kilowatt-hour, what is the daily cost of running the air conditioner?

• 40 pesos

• 60 pesos

• 15 pesos

• 30 pesos

Which of the following is the best safety practice when using electrical devices?

• Use wet hands when plugging in appliances.

• Overload electrical outlets to maximize power use.

• Turn off and unplug appliances when not in use.

• Unplug devices by pulling the cord instead of the plug.