AC and DC supply _ GCSE Physics

The video tutorial explains the difference between direct current (DC) and alternating current (AC). It describes how DC flows in one direction, commonly supplied by batteries, and how AC changes direction, as seen in mains electricity. The tutorial also covers how to calculate the period and frequency of AC using an oscilloscope, with examples demonstrating the UK's 50 Hertz frequency.

What type of current is supplied by batteries to most household appliances?

• Mains Electricity

• Static Electricity

• Alternating Current

• Direct Current

What is the typical voltage of the UK mains electricity supply?

• 110 volts

• 230 volts

• 120 volts

• 50 volts

How often does the UK mains electricity change direction per second?

• 40 Hertz

• 30 Hertz

• 50 Hertz

• 60 Hertz

What is the period of an AC waveform if its frequency is 50 Hertz?

• 0.02 seconds

• 0.05 seconds

• 0.01 seconds

• 0.1 seconds

How do you calculate the frequency of an AC waveform from its period?

• Multiply the period by 2

• Divide 1 by the period

• Multiply the period by 1

• Divide the period by 2