Delmar Unit 17 Review

A utility company plans to connect a total of 20uF of capacitance to a 7200 volt line. To make this connection four capacitors will be connected in series. What is the capacitance of each capacitor? Answer is 80uF. Now what is the minimum AC voltage rating of each capacitor?

A capacitor C is connected in series with a 400 resistor across a supply of frequency 60 Hz. A current of 3 A flows and the circuit impedance is 500. Calculate: (a) the value of capacitance, C, (b) the supply voltage, (c) the phase angle between the supply voltage and current, (d) the p.d. across the resistor, and (e) the p.d. across the capacitor. Draw the Phasor diagram.

A capacitor in series with a 200 ohms resistor draws a current of 0.3 ampere from 120 volts, 60 hz source. What is the value of the capacitor in microfarad? a. 8.7 b. 9.7 c. 6.7 d. 7.7

Regarding behavior of inductors and capacitors in circuits, select the correctstatement -a) Voltage leads current in a capacitive circuit,b) Current leads voltage by 180 degrees in a pure capacitor,c) Voltage leads current by 45 degrees in a pure inductor,d) Current leads voltage in an inductive circuit,e) Current lags voltage in a pure capacitor by 90 degrees,f) Current lags voltage by 90 degrees in a pure inductor

The diagram shows an inductor that is part of a circuit. The direction of the emf induced in the inductor is indicated. Which of the following is possible? elle O a. The current is increasing and leftward O b. The current is constant and leftward. O c. None of these. O d. The current is increasing and rightward. O e. The current is constant and rightward.