M
[email protected]
- Jan 1, 1970
- 0
Hi,
There is some basic stuff I don't understand about resistance. Legend holdsit that resistance works by transforming power into heat. So why then, I ask, would it result in decreased power usage by adding a resistor in a circuit? In other words, let's say I have a light bulb in a 12 V circuit and the current is 1 amp and thus the power usage is 12W. Thus the resistance is 12 Ohms, If I now add a 12 Ohms resistor to the circuit it doubles the resistance and cuts the current and thus the power usage in half. But why? If the lamp now uses half the power of the original circuit wouldn't the resistor also use half the power by turning it into heat and once again the power usage would be 12W? Confused. Thank you,
There is some basic stuff I don't understand about resistance. Legend holdsit that resistance works by transforming power into heat. So why then, I ask, would it result in decreased power usage by adding a resistor in a circuit? In other words, let's say I have a light bulb in a 12 V circuit and the current is 1 amp and thus the power usage is 12W. Thus the resistance is 12 Ohms, If I now add a 12 Ohms resistor to the circuit it doubles the resistance and cuts the current and thus the power usage in half. But why? If the lamp now uses half the power of the original circuit wouldn't the resistor also use half the power by turning it into heat and once again the power usage would be 12W? Confused. Thank you,