Electrical Energy and Domestic Electric Circuits (Leaving Cert Physics): Quizzes
📚Quizzes
Practise the questions
14 questions from this quiz
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Practise the questions
14 questions from this quiz
Why is very high voltage used for long-distance power transmission?
Why is very high voltage used for long-distance power transmission?
Reduces losses by lowering current
What is the formula for power loss in transmission lines?
What is the formula for power loss in transmission lines?
What voltage is mains electricity supplied at in Ireland and the EU?
What voltage is mains electricity supplied at in Ireland and the EU?
230V AC
Between what approximate voltages does the live wire vary?
Between what approximate voltages does the live wire vary?
+325V and -325V
What potential should the neutral wire be at?
What potential should the neutral wire be at?
Zero volts (Earth potential)
What colour is the earth wire in a plug?
What colour is the earth wire in a plug?
Green/yellow striped
What happens when a fault causes the live wire to touch a metal casing?
What happens when a fault causes the live wire to touch a metal casing?
Current flows through earth wire
In which wire must a fuse always be connected?
In which wire must a fuse always be connected?
Live wire
How do RCDs detect a dangerous situation?
How do RCDs detect a dangerous situation?
Monitor difference between live and neutral
When can an RCD NOT protect you from electrocution?
When can an RCD NOT protect you from electrocution?
Touching both live and neutral wires
What is one kilowatt-hour (kWh)?
What is one kilowatt-hour (kWh)?
Energy used by 1000W appliance in 1h
How many joules equal one kilowatt-hour?
How many joules equal one kilowatt-hour?
J
A 2000W kettle on 230V draws 8.7A. Which fuse should be used?
A 2000W kettle on 230V draws 8.7A. Which fuse should be used?
13A fuse
What is the main advantage of MCBs over traditional fuses?
What is the main advantage of MCBs over traditional fuses?
Faster operation and resettable