Electrical Power Distribution

Front

What is a step-up transformer?

Back

A device that increases voltage while decreasing current in an electrical circuit.

Front

What happens to voltage in a step-up transformer?

Back

Voltage increases.

Front

What is the power used when both a hair dryer (2200 watts) and a vacuum cleaner (400 watts) are on?

Back

2600 watts.

Front

What does a turbine in a fuel power station convert steam heat into?

Back

Mechanical energy.

Front

What is the function of a step-down transformer?

Back

To reduce voltage to a safe level for home use.

Front

What is electrical power?

Back

The rate at which electrical energy is transferred by an electric circuit.

Front

How is power calculated in an electrical circuit?

Back

Power (P) = Voltage (V) x Current (I).

Front

What is the unit of electrical power?

Back

Watt (W).

Front

What does it mean when we say an appliance has a power rating of 1000 watts?

Back

It means the appliance transfers 1000 joules of energy per second.

Front

What is the relationship between voltage, current, and resistance in a circuit?

Back

Ohm's Law: V = I x R.