Pencil Resistance Experiment 📝 || Physics Experiment 👍 👍

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We can all imagine that when current passes through a wire the larger the wire the more resistance it encounters and so the energy delivered to the load gets reduced. This is also called the transmission losses and are a big drain in our power distribution. We can study this using this very simple and interesting setup. We need a 9V battery, a torch bulb, holder flexible wires, Connect one end of battery to the bulb and another to the graphite . Connect a wire to the other end of the bulb and leave the other end of this wire unconnected as shown. An now when you connect this unconnected end to graphite very close to where it is connected to the battery the bulb lights up very brightly. If touch it at a distance the bulb glows dimly. When the touch it away from the battery connected end, much linger graphite is part of the circuit and current passes through much larger wire. This increases the resistance and less voltage is delivered to the bulb so the bulb glow dimly. If you connect the wire at very far end the voltage might be so small that the bulb will not even light up. So you can see the resistance increases with the length of the wire as being observed by here..

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