ch4 - Electricity And Electronics Fundamentals TECH 175...

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1 Electricity And Electronics Fundamentals TECH 175 Fall Semester 2007 Chapter 4 Energy 3 Voltage Polarities • Polarity of voltage drops across resistors is important in circuit analysis • Drop is + to – in the direction of conventional current • To show this, place plus sign at the tail of current arrow 4 Voltage Polarities 5 Voltage Polarities 6
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2 7 Current Direction • Current usually proceeds out of the positive terminal of a voltage source • If the current is actually in this direction, it will be supplying power to the circuit 8 Current Direction 9 Power • The greater the power rating of a light, the more light energy it can produce each second • The greater the power rating of a heater, the more heat energy it can produce 10 Power • The greater the power rating of a motor, the more mechanical work it can do per second • Power is related to energy – Capacity to do work 11 Power • Power is the rate of doing work – Power = • Power is measured in watts (W)
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This note was uploaded on 04/07/2008 for the course TECH 175 taught by Professor Yang during the Fall '07 term at Northern Illinois University.

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ch4 - Electricity And Electronics Fundamentals TECH 175...

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