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Electromagnetism & Electronics

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Wattless Current Electromagnetism & Electronics A (Amperes) The component of alternating current that is 90 degrees out of phase with AC voltage, consuming zero net electrical power. I_wattless = I_rms sin φ Wheatstone Bridge Electromagnetism & Electronics Ω (Ohms) An electrical bridge network consisting of four resistor arms used to measure an unknown electrical resistance with high precision. R_x = R₃ (R₂ / R₁) (when balanced: I_galvanometer = 0)