# Part 1 DC - Electronic Computer Engineering School of...

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www.brunel.ac.uk/about/acad/sed Syllabus • DC Circuits • AC Circuits • Electronics • Electric Machines • Drives • Electrical Safety • Aircraft Electrical Systems • Electrical System in MotorSport

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www.brunel.ac.uk/about/acad/sed Resistors in Series R 1 R 2 R 3 R n R t = R 1 + R 2 + R 3 + . . . . + R n

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www.brunel.ac.uk/about/acad/sed 10 20 1 k R t = ? 200 20 Example:
www.brunel.ac.uk/about/acad/sed Resistors in Parallel 1/R t = 1/R 1 + 1/R 2 + 1/R 3 + . . . . + 1/R n R 1 R 2 R 3 R n

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www.brunel.ac.uk/about/acad/sed Examples: 40 k 40 k 20 k 10 k R t = ? 1000 1000 R t = ? 2 k
www.brunel.ac.uk/about/acad/sed Ohm’s Law R A V R V I V = I R I = V/R R = V/I

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www.brunel.ac.uk/about/acad/sed Power in DC Circuits P = V I P = V 2 / R P = I 2 R (Watts)
www.brunel.ac.uk/about/acad/sed 2 10 k 2 A Examples: 10 12 V 5 k Find the total power dissipated in each of the above circuits.

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www.brunel.ac.uk/about/acad/sed Examples: Find R R 10 V 100 W R 4 10 V 5 W Find R
www.brunel.ac.uk/about/acad/sed I 4 Kirchhoff’s Current Law (KCL) Σ I = 0 I 1 + I 2 - I 3 - I 4 = 0 I 1 I 3 I 2

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www.brunel.ac.uk/about/acad/sed Example: Calculate I 1 , I 2 and I 3 I 2 0.4 A 0.2 A I 1 0.1 A I 3
www.brunel.ac.uk/about/acad/sed Kirchhoff’s Voltage Law (KVL) Σ V = 0 V – V 1 – V 2 = 0 V V 2 V 1 + - R 1 R 2 I + - + - V = V 1 + V 2 V = I R 1 + I R 2

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www.brunel.ac.uk/about/acad/sed Example: Calculate V 1 and V 2 + + + - - 12 V V 1 - V 2 - + - 2 V 6 V +
www.brunel.ac.uk/about/acad/sed Example: Calculate V 1 , V 2 and V 3 V 2 - V 1 + - 2 V V 3 + - + + - + - 1.5 V 6 V

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Part 1 DC - Electronic Computer Engineering School of...

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