At the end of this lesson you should be able to:

• Explain how a simple battery produces an electrical current.
• Define current, ampere, voltage, resistance, resisitivity and temperature coeffecient of resistance.
• Distinguish between (a)conventional current and electron current and (b) direct current and alternating current.
• Given the length, cross-sectional area, resistivity and temperature coeffcient of resistance, determine a wire's resistance at room temperature and some higher or lower temperatures.
• Use the equations for electric power to determine the power and energy dissipated in a resistor and calculate the cost of this energy to the consumer.
• Distinguish between the rms and peak values for current and voltage and apply these concepts in solving problems involving a simple ac circuit.