BASIC ELECTRONICS - OD1633 - LESSON 1/TASK 2
This process can be continued for any value of resistance. You can see that
as the resistance is halved, the current is doubled; when the resistance is
doubled, the current is halved.
This illustrates another important characteristic of Ohm's law--current
varies inversely with resistance when the applied voltage is held constant.
FIGURE 15.
RELATION BETWEEN CURRENT AND RESISTANCE.
d. Power.
Power, whether electrical or mechanical, pertains to the
rate at which work is being done.
Work is done whenever a force causes
motion. When a mechanical force is used to lift or move a weight, work is
done. However, force exerted without causing motion, such as the force of a
compressed spring acting between two fixed objects, does not constitute
work.
Previously, it was shown that voltage is an electrical force, and that
voltage forces current to flow in a closed circuit. However, when voltage
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