Chapter 43 - Uses and Effects of Electricity Flashcards
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
