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Unformatted text preview: Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed [email protected] Dr Mohamed K Darwish Room H207 Electrical Engineering ME1331 Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed Recommended book: Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed Phase Alternating Current Circuits Single 1) Resistive Load v i v i 2 π ω t π R v i R = v / i φ = 0 (the angle between v and i) f i f R 2 π ω t π P (t) P avg Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed 2 π 2) Pure Inductive Load ω t v i v i π L v i X L = v / i φ = 90 f i f X L X L = 2 π f L ( X L is called inductive reactance ) 2 π π P (t) P avg = 0 Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed Example: Calculate the inductive reactance of a coil of 0.1 Henry inductance when connected to a 50 Hertz supply. (X L = 31.42 Ω) Example: Calculate the inductance of a coil taking a current of 4 A when connected to a 240 V, 50 Hz supply. (L = 0.191 H ) Example: A coil having an inductance of 0.2 H and negligible resistance is connected across a 200 V a.c. supply. Calculate the current if the frequency is: (a) 25 Hz, (b) 500 Hz. (a) 6.365 A; (b) 0.3182 A Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed 2 π 3) Pure Capacitive Load ω t v i v i π C v i X C = v / i φ = 90 f i f X C X C = 1 / (2 π f C) (X C is called capacitive reactance) 2 π π P (t) P avg = 0 ω t Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed Example: Calculate the capacitive reactance of a capacitor taking a current of 2 A when connected to a 240 V, 50 Hz supply (X C = 120 Ω) Example: Calculate the capacitance of a capacitor taking a current of 4 A when connected to a 240 V, 50 Hz supply....
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This note was uploaded on 04/20/2011 for the course ENG 1333 taught by Professor Brr during the Spring '10 term at American College of Computer & Information Sciences.
 Spring '10
 brr
 Electrical Engineering

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