In the above circuit, we know we have a battery voltage of 18 volts and a lamp resistance of 3 Ω. Using Ohm’s Law to determine current, we get: Now that we know the c… See more

Let’s try taking that same circuit and increasing the battery’s voltage to see what happens. Intuition should tell us that the circuit current will increase as the voltage increases a… See more

Notice that the power has increased just as we might have suspected, but it increased quite a bit more than the current. Why is this? Because power is a function of voltage mul… See more

A historical note: it was James Prescott Joule, not Georg Simon Ohm, who first discovered the mathematical relationship between power dissipation and current through a r… See more