Current
Current is a measurement of the flow of electricity. Specifically it measures how many electrons pass through a point over a measured amount of time.
Symbol: I Units: Ampere (A) I = Q/t Using an analogue of a river of water we would describe the current as the flow of the water droplets as the river flows downstream. The more water passes in a second, the higher the current. |
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Voltage
Voltage is used to describe the potential energy between two points. A simpler of describing this is to think about how much "potential energy" is used up by a load.
Symbol: V Units: Volts (V) If we continue with our water analogue then voltage is the difference in the pressure of the water between two points. For example what is the difference of the pressure of the water leaving your shower and the pressure of it entering the drain? Checkpoints Practice
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Chapter 4
Questions 8
Questions 8
Energy / Work
Power
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Checkpoints Practice
Chapter 4
Question 2, 3,
Question 2, 3,