Podcast
Questions and Answers
What is the primary characteristic of alternating current (AC)?
What is the primary characteristic of alternating current (AC)?
- It flows in one direction only.
- It regularly changes its direction and size. (correct)
- It is produced by batteries and solar cells.
- It remains constant on a voltage-time graph.
Which of the following sources provides direct current (DC)?
Which of the following sources provides direct current (DC)?
- Car batteries (correct)
- The National Grid
- Home electrical supply
- Power stations
At what frequency is the mains electrical supply in the UK generated?
At what frequency is the mains electrical supply in the UK generated?
- 60 Hz
- 100 Hz
- 30 Hz
- 50 Hz (correct)
What does the positive and negative values on a voltage-time graph indicate?
What does the positive and negative values on a voltage-time graph indicate?
What is the voltage of the mains electrical supply found in UK homes?
What is the voltage of the mains electrical supply found in UK homes?
Flashcards
Electric Current
Electric Current
The movement of electrically charged particles, for example, electrons moving through a wire or ions moving through a solution.
Direct Current (DC)
Direct Current (DC)
An electric current that flows in one direction only.
Alternating Current (AC)
Alternating Current (AC)
An electric current that regularly changes its direction and size.
Mains Electrical Supply
Mains Electrical Supply
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Frequency
Frequency
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Study Notes
Types of Electric Current
- Electric current flows as either direct current (DC) or alternating current (AC).
- DC flows in one direction only.
- AC regularly changes direction and size.
- Visually, DC is represented by a horizontal line on a voltage-time graph, AC by a fluctuating curve.
- Car batteries, dry cells, and solar cells supply DC.
- Power stations produce AC using magnets.
AC Characteristics
- The UK mains electrical supply is AC.
- Mains voltage is 230 Volts (V).
- The frequency of the UK mains supply is 50 Hertz (Hz).
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Description
Explore the fundamental concepts of electric current in this quiz, focusing on the differences between direct current (DC) and alternating current (AC). Understand their characteristics, graphical representations, and practical applications like car batteries and mains supplies. Test your knowledge on voltage and frequency in AC systems.
