Electricity in the home Flashcards
Mains supply is …
ac
Battery supply is …
dc
What are the 2 types of electricity supplies
-alternating current (ac)
-direct current (dc)
What happens in ac
-the … is … changing …
-alternating … are produced by alternating …
-where the … and negative ends …
-the current is constantly changing direction
-alternating currents are produced by alternating voltages
-where the positive and negative ends switch
What type of electricity supply is the Uk mains supply
ac at 230v
What is the frequency of the ac mains supply
50Hz (hertz)
How does direct current work
-direct … is a current that is always … in the … direction
-it’s created by a … voltage
-direct current is a current that is always flowing in the same direction
-it’s created by a direct voltage
What are most electrical appliances connected to the mains supply by
Three-core cables
What are the three-core cables
-live wire: brown
-neutral wire: blue
-earth wire: yellow and green
What colour is live wire
Brown
What colours is neutral wire
Blue
What colour is earth wire
Yellow and green
How can the live wire give you an electric shock
-your body is at …v, so if you touch a … wire a large … difference is … across your body so … flows … you
-this causes a … electric … that could injure or even … you
-even if the … socket or light is turned … there is still a … as even tho there isn’t a … flowing there is still a … in the … wire
-your body is at 0v, so if you touch a live wire a large potential difference is produced across your body so current flows through you
-this causes a large electric shock that could injure or even kill you
-even if the plug socket or light is turned off there is still a danger as even tho there isn’t a current flowing there is still a pd in the live wire
