Unformatted text preview: ELECTRICITY ELECTRICITY D.C. stands for direct current which flows in one direction only ( to +)
A.C.stands for alternating current which changes direction 50 times per second. ELECTRICITY
D.C. is seen as a straight line on the oscilloscope.
A.C. is seen as a wavey line on the oscilloscope. ELECTRICITY
An electric current is a flow of charged particles called electrons.
You will see the circuit symbols on the side wall. ELECTRICITY
ELECTRICITY Current has the symbol I and is measured in amps (A) Resistance has the symbol R and is measured in ohms (Ω ) Voltage has the symbol V and is measured in volts(V) ELECTRICITY
Current is measured with an ammeter in series.
Voltage is measured with a voltmeter in parallel. ELECTRICITY
V = IxR
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