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Also see current, voltage, and direct current. In electricity, alternating current (AC) occurs when charge carriers in a conductor or semiconductor periodically reverse their direction of movement. Household utility current in most countries is AC with a frequency of 60 hertz (60 complete cycles per second), although in some countries it is 50 Hz. The radio-frequency (RF) current in antennas and transmission lines is another example of AC. An AC waveform can be sinusoidal, square, or sawtooth-shaped. Some AC waveforms are irregular or complicated. An example of sine-wave AC is common household utility current (in the ideal case).
If the magnetic field in a traveling EM wave has a peak magnitude of 17.5 nT at a given point, what is the peak magnitude of the electric field? The electric field is 8 9 E cB = = Ã Ã = (3.00 10 m s 17.5 10 T 5.25V m. )(â) 5. What is the frequency of a microwave whose wavelength is 1.60 cm?The frequency of the microwave is 10 ()() 82 3.00 10 m s1.88 10 Hz.1.60 10 m cf Î» â Ã= = = ÃÃ 20.he electric field is 8 9 E cB = = Ã Ã = (3.00 10 m s 17.5 10 T 5.25V m. )(â) 5. What is the frequency of a microwave whose wavelength is 1.60 cm? The frequency of the microwave is 10 ()() 82 3.00 10 m s1.88 10 Hz.1.60 10 m cf Î» â Ã= = = ÃÃ 20.