2 Assuming electric plugtypes that could allow it which woul

2. Assuming electric plug-types that could allow it, which would be more damaging—to plug a 220 V appliance into a 110 V outlet or to plug a 110 V appliance into a 220 V outlet? (Consider Ohm’s law and the nature of electric power to arrive at your answer)

Solution

Electric Power P = V^2 / R

reducing the voltage by half mean new power P´ = (1/4) P

If we supply a voltage which is too high than rated on device, it draws too much current and burns out, if the voltage is too low it draws too little current and will not perform to its maximum power. if we plug a device configured to 110 V into 220 V outlet , imagine the device is a room heater or hari dryer, it will develop close to four times the designed heat, since power is praportional to square of Voltage and probably burn out in few min if the resistors are not prepared ,it most likely will burn out very quickly. if the device can handle the extra heat, the device may not fail for a long time

if we plug a 220V device to 110 V outlet the deive may not damage immediately compared to the previous case, if it is a mechanical device it may fail to start, since it receive only one quarter of the power , or it may take up more current than it is designed for, and eventually burn out.