Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 38, Problem 4SQ
Why are capacitors connected into the power circuit?
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how do capacitors work in a circuit?
How much resistance must be put in series with a 40-microfarad-capacitor connected to a 110 volt, 120-cycle source to limit the current to 3 amperes? What will be the drop across the capacitor and across the resistor? How much power is expended?
How does the internal resistance of the multimeter (in voltage setting) affect the charging/discharging rate of the capacitor. Explain.
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Electric Motor Control
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- In reference to the load, how are capacitors connected to help prevent voltage spikes and surges? Are capacitors connected in parallel or in series with the load?arrow_forwardA 5-ohm resistor is connected in series with a 25 micro-farad capacitor. A source voltage of 158 volts, 50 Hz supplies the combination. Determine the following: a. Circulating current b. Voltage across the resistor c. Voltage across the capacitorarrow_forwardwhat type of resistor is used to discharge a capacitor?arrow_forward
- In reference to the load how are inductors connected to help prevent voltage spikes and surges?arrow_forwardCalculate t for capacitors in parallel and series for charging and dischargingarrow_forwardA capacitor of 1µF is charged to 100 volts and then disconnected from the power supply. A second but uncharged capacitor of 3µF is then connected across the first capacitor. What is the voltage across the parallel combination? O a. 110 volts O b. 45 volts O c. 66 volts O d. 25 voltsarrow_forward
- What is the voltage across the plates of capacitor #1 (C1)? Select one: a. 6.36 volts b. 2.71 volts c. 5.65 volts d. 7.32 voltsarrow_forwardwhat are standard impluse voltages, mention their values ?arrow_forwardWhat effect would the multimeter's internal resistance (in the voltage setting) have on the capacitor's charging/discharging rate?arrow_forward
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