The power usage of a DC strip heater can be determined in either of two ways: (1) Heater resist- ance and voltage drop can be measured simulta- neously and power computed, or (2) heater voltage drop and current can be measured simultaneously and power computed. Instrument manufacturer specifications are listed (assume 95% level): Ohmmeter: - 1 Ω = Resolution, 0.5% =Uncertainty (% reading) Ammeter: 0:5 A = Resolution, 1% =Uncertainty (% reading) Voltmeter: 1 V = Resolution, 0.5%=Uncertainty (% reading) For loads of 10 W, 1 kW, and 10 kW, determine the best method based on an appropriate uncertainty analysis. Assume nominal values as necessary for resistance, current, and voltage.
The power usage of a DC strip heater can be determined in either of two ways: (1) Heater resist- ance and voltage drop can be measured simulta- neously and power computed, or (2) heater voltage drop and current can be measured simultaneously and power computed. Instrument manufacturer specifications are listed (assume 95% level):
Ohmmeter: - 1 Ω = Resolution, 0.5% =Uncertainty (% reading)
Ammeter: 0:5 A = Resolution, 1% =Uncertainty (% reading)
Voltmeter: 1 V = Resolution, 0.5%=Uncertainty (% reading)
For loads of 10 W, 1 kW, and 10 kW, determine the best method based on an appropriate uncertainty analysis. Assume nominal values as necessary for resistance, current, and voltage.
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