Basics of Electricity

REVIEW 1

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1. The fundamental building block of all matter is the:
  1. atom
  2. molecule
  3. crystal
2. Identity the elements of the atom to which the arrows are pointing in the drawing below.
3. The three factors that establish the characteristics of electricity are current, voltage and resistance. Match each of these electrical terms with its definition.

Current A. The action of electricity flowing through a conductor, such as copper wire.
Resistance B. Electrical pressure.
Voltage C. Opposition to current flow in a conductor.

4. Listed in the left hand column below are the three factors that characterise electricity. Complete the table by indicating how each is measured and the letter used to symbolise each.

Factor Standard Symbol Measured in
Voltage    
Current    
Resistance    

5. Current, voltage, and resistance are always in balance as defined by:
  1. Murphy's Law.
  2. Ohm. s Law.
  3. Einstein's Law.
6. Give the mathematical equation for Ohm's Law to find resistance.

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