S13Phys2BaLec26B

# 3 generator a device that uses mechanical energy to

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3) Generator: a device that uses mechanical energy to create electrical energy.

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Batteries Internal resistance, r, will effectively lower the emf of the battery and, thus, must be taken into account. For now we will assume that all batteries are ideal unless specifically told otherwise. If you do encounter internal resistance know that: Δ V ba = V b – V a Δ V ba = – Ir For this circuit: = IR + Ir
Circuits A typical circuit problem is to solve for the power/voltage/current at a specific point (like at a resistor). This simplest circuit to calculate the current for is the following: Using Ohm’s Law we find that: I = /R Technically, this is the only circuit you can use Ohm’s Law to solve for the current through the resistor.

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Circuits Let’s say we have a circuit with two resistors in series. When these two resistors are hooked up to the battery, a current is then established. In this circuit, the amount of current moving through R 1 equals the amount of current moving through R 2 (and the same as the battery as well). I bat = I R1 = I R2 = I
Circuits The potential difference across either resistor will sum to be the potential difference across the battery. In general, for series resistors: Δ V bat = Δ V 1 + Δ V 2 Equivalent resistance will be:

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For Next Time (FNT) Keep reading Chapter 27 Keep working on the homework for Chapter 26
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