GCSE Physics - Alternating (AC) and Direct Current (DC) #21

The video tutorial explains the differences between alternating current (AC) and direct current (DC). AC constantly changes direction, while DC flows in one direction. UK mains electricity is AC, operating at 50 Hertz and around 240 volts. Direct current is found in batteries and cells. Oscilloscopes are used to visualize voltage changes over time.

What is the main characteristic of alternating current (AC)?

• It is only used in batteries.

• It involves the constant swapping of current direction.

• It has a fixed voltage.

• It flows in one constant direction.

In the UK, what is the frequency of the main supply electricity?

• 60 Hertz

• 40 Hertz

• 50 Hertz

• 30 Hertz

What is the typical voltage range for UK main supply electricity?

• 100 to 200 volts

• 230 to 240 volts

• 250 to 260 volts

• 200 to 210 volts

Which of the following devices typically uses direct current (DC)?

• Washing machine

• Refrigerator

• Cell phone

• Television

What device is used to display potential difference graphs over time?

• Voltmeter

• Ammeter

• Oscilloscope

• Multimeter