TOPICS: Atoms Electrons Current |
What is voltage, current, and resistance? |
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Battery and resistor |
TOPICS: Atoms Electrons Current ACV |
So what do they mean by AC voltage? In the following example a light bulb has a resistance of 240 ohms (yes, light bulbs have resistance too!) It is drawing current from a 120V outlet. Do you thing you can answer this complex mathematical question! OH COME ON. TRY IT! |
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AC voltage with bulb and switch. |
Battery and three resistors. |
TOPICS: Atoms Electrons Current ACV Parallel |
Outlets in your home are connected so that each bulb, resistance, or whatever,
keeps recieving current when a second bulb is unpluged. This is achieved by
connecting the outlets as follows:
The adjacent diagram shows three resistors
connected in what is referred to as a parallel connection.
If one of the resistors
is removed the current still has a clear path from the posative of the source back
to the negative. Hey, if somthins in ya way, go around it!.
If you take a good look at this connection, you will see that each resistor is
connected directly across the 12V source. Thus! each resistor feels a voltage of
12V. Guess what! You can calculate the current.
How you ask? Oh come on, you know how. V / R = I
The current in the 100 ohm resistor can be found by dividing 12V by 100 ohms.
The current in the 200 ohm resistor can be found by dividing 12V by 200 ohms.
The current in the remaining resistor is found in the same way. The three currents could then be added together to determine the amount of current taken from the voltage source. Try to solve the problem below: |
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Battery and three resistors. |