Re: Electronics 101 Question .....

Posted by Farmall_Ryan on October 25, 2006 at 17:19:00 from (69.202.135.234):

In Reply to: Electronics 101 Question ..... posted by MMB on October 25, 2006 at 15:35:07:

First of all there are 2 basic equations to understand. The first is Ohm"s law which states that voltage = current x resistance. This is written symbolically as V = I x R.

The second equation is for dealing with power. THis equation states that power (measured in watts) = voltage x current. This can be written as P = V x I.

Using Ohm"s law in conjunction with the power equation, we can re-write it different ways such as:

P = I^2 x R or P = V^2 / R

Now looking back at the first equation (ohm"s law) you can see that if we know the voltage is 6V and the resistance is 3 ohms, then we know the current would be 2 amps. Using the power equation that says P = I^2 x R, we can calculate the power loss in the resistor as heat would be equal to 12 watts.

Using the same thought process for the 10 ohm resistor we see that the current is equal to .6 amps. Similarly the power loss in the resistor in this case would be equal to 3.6 watts.

Hope this helps.

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