Chapter 43 - Uses and Effects of Electricity Flashcards
(19 cards)
Direct current
Current that flows in one direction only
What devices use direct current?
Battery
Mobile phone
Torch
Alternating current
Current that flows in a continually changing direction
What devices use alternating current?
Plug sockets
_.c can be transmitted over much longer distances than _.c
a.c can be transmitted over much longer distances than d.c
What is the average voltage in sockets in homes?
230 volts
What is the unit for electrical energy?
kilowatt-hour (kWh)
What is the average price of one electrical unit of energy?
14 cent
Give examples of the everyday uses of the heating effect of electricity
○Boiling water in a kettle
○Immersion heater in a hot press
○In an electrical oven, the grill and oven are used to cook food
Give examples of the everyday uses of the chemical effect of electricity
○Electroplating
○Electrolysis
○Recharging your phone creates a chemical reaction in the phone battery. This restores the battery to full power
Give examples of the everyday uses of the magnetic effect of electricity
○Electromagnet
○Electric motor
○Speakers
What is electroplating
Electroplating is when expensive metal like silver is coated onto a less expensive metal
Fuse
A deliberate weak link in a circuit which will break if the current exceeds the preset value
Circuit breaker
Safety device that limits the size of the current flowing through a circuit
What is the difference between a fuse and a circuit?
○When the wire in a fuse melts, it cannot be reused and must be replaced
○When a circuit breaker turns off the current, all you have to do is push the switch up again
What are the names of the three wires in a plug?
Earth
Neutral
Live
What colour is the live wire?
brown
What colour is the neutral wire?
blue
What colour is the earth wire?
green/yellow stripes
