Summary An electric circuit consists of a voltage source, a load, and a conductor Current flow can be varied by changing the voltage or resistance Ohm’s law defines the relationship among current, voltage, and resistance: I = E/R Kirchhoff’s current law and voltage law define algebraic sums
Chapter 7 Power
Objectives After completing this chapter, you will be able to: Define power as it relates to electric circuits State the relationship of current and voltage Solve for power consumption in an electrical circuit Determine the total power consumption in a series, parallel, or series-parallel circuit
Power Power Rate at which energy is delivered to a circuit Rate at which energy is dissipated by the resistance in a circuit Watt Basic unit of power
Power (cont’d.) Relationship of power, current, and voltage may be expressed as: P = I x E, where: I represents current through the circuit E represents voltage applied to the circuit
Power Application (Circuit Analysis) Total power dissipated in a series or parallel circuit:
Summary Power is the rate at which energy (heat) is dissipated in a circuit Power is measured in watts Power is directly proportional to current and voltage P = IE
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