Answer:
A laptop has a battery pack and can be run on the battery for some time. It needs recharging which will use electricity but not as much as a desktop computer. The amount of power any computer will use depends on a number of factors such as the amount of time it is left on standby. You are probably better to leave the desktop on standby than to turn it off, because it could use more power to reboot all the time than when left on standby. This would only apply if you use the desktop daily or more often.