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No electrical or electronic equipment is 100% efficient, which means a certain amount of power is wasted in heat.
Depending on how much power the equipment uses (in wattage) dictates what you need to do to prevent heat becoming a problem.
e,g, an electric motor is usually no better than 80-90% efficient. That means at least 10% is lost in heat, either through friction or electrical resistance. If your motor is fairly modest, say 10 watts then 1 watt of heat is not going to present an issue and the air around the motor will be sufficient to keep things sensible. However if your motor is using say 200 watts, then 20 watts of heat requires some form of active cooling to prevent things getting a bit toasty.
Depending on how much power the equipment uses (in wattage) dictates what you need to do to prevent heat becoming a problem.
e,g, an electric motor is usually no better than 80-90% efficient. That means at least 10% is lost in heat, either through friction or electrical resistance. If your motor is fairly modest, say 10 watts then 1 watt of heat is not going to present an issue and the air around the motor will be sufficient to keep things sensible. However if your motor is using say 200 watts, then 20 watts of heat requires some form of active cooling to prevent things getting a bit toasty.
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