Alternating and Direct Current | Electricity | Physics | FuseSchool

The video explains the differences between alternating current (AC) and direct current (DC), highlighting how each type of current flows and their respective uses. DC flows in one direction, typically from a battery, while AC changes direction, as seen in mains power supplies. The video also discusses the role of transformers in adjusting AC voltage and the importance of AC in the national grid. Additionally, it covers how to interpret oscilloscope traces for both AC and DC, including calculating frequency and potential difference.

What is the direction of electron flow in a direct current (DC) circuit?

• Electrons flow in one direction

• Electrons do not flow

• Electrons flow randomly

• Electrons flow in both directions

Why is alternating current (AC) preferred for mains supply?

• It is safer than direct current

• It requires less maintenance

• It is easier to change voltage using transformers

• It is cheaper to produce

What is the unit of frequency for alternating current?

• Ohms

• Amperes

• Hertz

• Volts

How can you identify an AC trace on an oscilloscope?

• The trace is a straight line

• The trace shows constant voltage

• The trace shows changing potential difference

• The trace is circular

If one cycle of an AC takes 0.02 seconds, what is the frequency?

• 200 Hertz

• 100 Hertz

• 50 Hertz

• 25 Hertz