Unformatted text preview: Resistive DC Circuits Direct current (DC) means that the current flow in a circuit is steady rather than varying in time. Batteries and plugin chargers for various devices are two examples of DC. The usual symbol for a battery is shown at right, along with a value for the voltage it might supply. It is important to note that the symbol is here shown with the plus side up. The normal approach to solving for all the currents and voltage drops involved will be to apply Kirchhoff’s Voltage Law . For the example circuit below, two arbitrary current loops have been added called I ₁ and I ₂ . These loops will guide us in figuring out the real answers. Notice that they have been placed so that they pass through the 3 Ω resistor in the same direction. We begin following the first loop from the lower left corner of the circuit. Moving upwards, we first encounter the negative side of the battery, so the voltage change there will be 60 . Next the 8 Ω resistor is met, and the current flowing...
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This note was uploaded on 04/05/2012 for the course PHYS 131 taught by Professor Tibbets during the Spring '11 term at Cuyamaca College.
 Spring '11
 Tibbets
 Charge, Current

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