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 0 answersPost by thomas kotch on July 11, 2011What about the internal resistance in the battery?

### Circuits

• Series combination of resistors: The equivalent resistance is R = R1 + R2 + …
• Parallel combination of resistors: If R1, R2, … are connected in parallel, the equivalent resistance R is such that 1/R = 1/R1 + 1/R2 + …
• RC circuit: Connect a battery with emf E, a resistor with resistance R, and a capacitor with capacitance C, and a switch. When the switch is open, no charge flows and the capacitor remains uncharged. If the switch is closed at time t = 0, the capacitor begins charging. The charge on the capacitor, as a function of time t, is given by Q = CE [1 – exp(-t / RC)]. The product RC has the units of time and is called the time constant of the RC circuit.

### Circuits

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Simple Rules 0:16
• Resistance in Series
• Current Passing Per Second is Equal
• Potential Difference
• Parallel Circuit, R1, R2
• Battery, Current Starts From Positive Terminal to Negative Terminal
• Series Combination of Resistances 13:06
• R1, R2 Connected to Battery
• Va-Vb=Ir1,Vb-Vc=Ir2
• Three Resistance Connected in Series Req=r1+r2+r3
• Parallel Combination of Resistance 19:28
• R1 and R2 Combined Parallel
• I=i1+i2 (Total Current)
• Requ=I/E
• A Simple Circuit 27:57
• Intro
• Current Splits
• Total Resistance
• Current I= 6/17.2
• Another Simple Circuit 37:46
• Battery has Small Internal Resistance
• 2 Ohms Internal Resistance, and Two Resistance in Parallel
• Drawing Circuit
• Finding Current
• RC Circuit 55:17
• Battery , Resistance and Capacitance Connected
• Current is Function of Time
• R, C are Time Constants
• Extra Example 1: Resistor Current/Power
• Extra Example 2: Find Current
• Extra Example 3: Find Current
• Extra Example 4: Find Current