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ELEC2110-Lecture _5-Monday 1-24-11

# ELEC2110-Lecture _5-Monday 1-24-11 - ELEC 2110 Elements of...

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ELEC 2110 Elements of Electrical Engineering Lecture # 5 1/24/11 (Monday) ) 10 cos( 5 t v s

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LECTURE #5 OUTLINE II – HW #1 DUE WED 1/26/11 III– CHAPTER 1 CHARGE, CIRCUIT ELEMENTS IV – CHAPTER 2 KIRCHHOFF’S CURRENT/VOLTAGE LAWS EQUIVALENT RESISTANCE DIVIDER CIRCUITS PRACTICE PROBLEMS
CHARGE Charge is a fundamental physical quantity Charge is an electrical property of the atomic particles of which matter consists Measured in coulombs (C). Types Positive Negative Opposite effects; use + & - signs Electron negative sign Proton Positive sign

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CURRENT The direction of current flow is associated w/ positive charges
VOLTAGE Voltage (or potential difference) is the energy required to move a unit charge through an element, measured in volts (V). Voltage is a signed quantity ( + or -) Mathematically, (volt) w is energy in joules (J) and q is charge in coulomb (C). dq dw v ab /

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VOLTAGE Electric voltage, v ab, is always across the circuit element or between two points in a circuit. v ab > 0 means the potential of a is higher than potential of b. v ab < 0 means the potential of a is lower than potential of b.
VOLTAGE i + v i + v Voltage Drop (+ ) Voltage Rise (- + ) Positive Voltage Negative voltage Passive sign convention Voltage is a signed quantity ( + or -)

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POWER Power is the time rate of expending or absorbing energy, measured in watts (W). Mathematical expression:
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ELEC2110-Lecture _5-Monday 1-24-11 - ELEC 2110 Elements of...

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