An alternating voltage V (in volts) is represented by the equation:V = 300 sin(100πt) What is the value of "f" for this voltage?
Correct answer: B. 50 Hz
- A. 100 Hz
- B. 50 Hz
- C. 25 H
- D. 200 Hz
Explanation
Voltage = Maximum Voltage x sin (2πft) Therefore, 2f = 100 and frequency = 50 Hz
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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