Subelement B: Electrical Math— Topic 18: Calculations
Question 3-18B5
Element 3 (GROL)Given a power supply with a full load voltage of 200 volts and a regulation of 25%, what is the no load voltage?
Explanation
Voltage regulation in a power supply describes how much the output voltage changes from no load to full load. It's calculated as the percentage difference between the no-load voltage and the full-load voltage, relative to the full-load voltage.
The formula for voltage regulation is:
Regulation (%) = [(V_no_load - V_full_load) / V_full_load] * 100
Given:
V_full_load = 200 V
Regulation = 25%
We can rearrange the formula to solve for V_no_load:
0.25 = (V_no_load - 200) / 200
0.25 * 200 = V_no_load - 200
50 = V_no_load - 200
V_no_load = 50 + 200
V_no_load = 250 volts
This calculation shows that with 25% regulation, the voltage increases by 25% of the full-load value when the load is removed. Thus, 25% of 200 V is 50 V, which added to 200 V gives 250 V. The other options are incorrect based on this definition.
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