Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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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?
A 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:
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b. Voltage across the resistor
c. Voltage across the capacitor
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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_forwardHow does the internal resistance of the multimeter (in voltage setting) affect the charging/discharging rate of the capacitor. Explain.arrow_forwardwhat type of resistor is used to discharge a capacitor?arrow_forward
- The varactor acts as a variable capacitor, explain with details?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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