Final answer:
A blow dryer's operation when turning on and blowing air represents a closed circuit, allowing electricity to flow properly and not an example of a short circuit, which is a dangerous low-resistance path causing heat buildup.
Step-by-step explanation:
When a blow dryer is on and air begins to flow, this situation does not exemplify a closed circuit. Rather, it signifies that the electrical circuit within the blow dryer is complete and the device is operating as intended. A closed circuit allows electricity to flow from the power source, through the appliance, and back again. This enables the heating element and the fan within the blow dryer to function.
A short circuit, on the other hand, occurs when insulation on wires wears through and allows contact between two wires that should not normally touch. This creates a low-resistance path and can cause a high amount of power to be dissipated very quickly, leading to overheating, melting, or potentially ignition. Thermal energy in this context refers to the heat generated due to electrical resistance. Proper functioning electrical devices like blow dryers ensure that heat is managed and dissipated safely to prevent such hazardous situations.
It is important to note that fuses and circuit breakers are designed to handle high currents for brief periods when devices like blow dryers are turned on. These safety mechanisms help prevent electrical hazards resulting from overheating or potential short circuits. Therefore, the operating blow dryer presents an example of a properly managed flow of electricity in a functioning appliance, not a short circuit.