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Thermostat is used in non-automatic electric iron
True
False
False
A non-automatic electric iron does not contain a thermostat, as the term 'non-automatic' implies the absence of an integrated temperature control mechanism. In such devices, the heating element remains continuously energized until the user manually disconnects the power supply.
A non-automatic electric iron does not contain a thermostat, as the term 'non-automatic' implies the absence of an integrated temperature control mechanism. In such devices, the heating element remains continuously energized until the user manually disconnects the power supply.
H=I2Rt тАФ Heat generated in the element
P=RV2тАЛ тАФ Power consumption of the iron
The heating element operates on the Joule heating principle, given by H=I2Rt. In non-automatic irons, there is no bimetallic strip or thermal sensor to break the circuit when a preset temperature is reached, meaning the temperature continues to rise until heat loss by convection/radiation matches the input power.
Non-automatic irons lack feedback control loops.
The heating element is connected directly to the supply via a manual switch.
Automatic irons use a bimetallic strip thermostat to cycle power.
Manual operation is required to prevent overheating.
Simple construction
Lower cost of manufacturing
High reliability due to fewer mechanical parts
High risk of fabric scorching
No energy efficiency (wasted power)
Requires constant user monitoring
Basic ironing tasks
Low-cost domestic appliances
Industrial applications requiring constant high heat
| Feature | Non-Automatic Iron | Automatic Iron |
|---|---|---|
Thermostat Presence | Absent | Present |
The primary difference between automatic and non-automatic appliances is the presence of a closed-loop control system.
Non-automatic appliances rely entirely on manual intervention for state changes.
B is correct тАФ A non-automatic electric iron does not include a thermostat, as manual control of the switch is the only way to regulate its operation.
Always differentiate between open-loop (non-automatic) and closed-loop (automatic) systems in electrical instrumentation exams.