1. 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.

2. ELECTRICITY D.C. is seen as a straight line on the oscilloscope. D.C. is seen as a straight line on the oscilloscope. A.C. is seen as a wavey line on the oscilloscope. A.C. is seen as a wavey line on the oscilloscope.

3. ELECTRICITY An electric current is a flow of charged particles called electrons. An electric current is a flow of charged particles called electrons. You will see the circuit symbols on the side wall. You will see the circuit symbols on the side wall.

4. ELECTRICITY Current has the symbol I and is measured in amps (A) Current has the symbol I and is measured in amps (A) Resistance has the symbol R and is measured in ohms (   Resistance has the symbol R and is measured in ohms (   Voltage has the symbol V and is measured in volts(V)

5. ELECTRICITY Current is measured with an ammeter in series. Current is measured with an ammeter in series. Voltage is measured with a voltmeter in parallel. Voltage is measured with a voltmeter in parallel.

6. ELECTRICITY V = IxR V I R