The voltage across the terminals of a battery is when the battery is connected to a load. What is the battery’s internal resistance?
The battery's internal resistance is .
We have to find the internal resistance of the battery.
The resistor is connected to the battery, a voltage drop occurs which is . This is the potential difference across the resistor . So, determine the current through the circuit by using Ohm's law by
A battery that is connected to a circuit, the current that flows through the circuit is given by equation in the form
Where is the emf of the battery which is . Solve the equation for to be
Putting the values for and into equation to get by
A string of holiday lights can be wired in series, but all the bulbs go out if one burns out because that breaks the circuit. Most lights today are wired in series, but each bulb has a special fuse that short-circuits the bulb—making a connection around it—if it burns out, thus keeping the other lights on. Suppose a string of lights is connected in this way and plugged into a outlet. By what factor does the power dissipated by each remaining bulb increase when the first bulb burns out?
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