2.8
2.8 24 November 2010 10:13
· 2.8 recall that mains electricity is alternating current (a.c.) and understand the difference between this and the direct current (d.c.) supplied by a cell or battery.
> d.c. sources
· cell
· battery
· dc power pack
· dc generator a.c. sources
· mains
· ac power pack
· ac generator
· 2.8 recall that mains electricity is alternating current (a.c.) and understand the difference between this and the direct current (d.c.) supplied by a cell or battery.
> d.c. sources
· cell
· battery
· dc power pack
· dc generator a.c. sources
· mains
· ac power pack
· ac generator