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Unformatted text preview: ight, the circuit consists of the battery, the switch and the lamp along with the conductor wires. When switched is closed, the circuit is provides a closed path for the charge carriers to move energy from the battery to the lamp, where it is converted to light as well as some unwanted heat. 9 EE1002 Introduction to Circuits and Systems Switch
+ Lamp - Battery (a) Physical system i v
i (b) Conceptual representation iL VS
RL Vs vL Vs RL (c) Symbolic representation Electric Current Electrical current is the time rate of flow of electrical charge through a circuit. The units are amperes (A), which is equivalent of coulomb/sec (C/S). It is measured as the net flow of charge across a cross‐section. 10 EE1002 Introduction to Circuits and Systems i (t ) dq(t )
t q(t ) q (t0 ) i (t )dt t0 where i(t) is the current in the conductor, q(t0) is the initial charge stored at time t0 . Current in any branch of a circuit is specified by both magnitude and direction. Reference directions: In analyzing circuits, before actual current...
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- Winter '14