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Chapter 8: Batteries and DC Analog
Meters
Abstract:
This lab explored the properties direct current and analog meters.
We explored the internal resistance of a battery and the effects of batteries in
series.
Analog voltmeters and ammeters were explored by determining the
resistance of both in circuits and directly.
Finally, the effect of a voltmeter’s
internal resistance on voltage measurements was determined by taking
voltage measurements of the same circuit setup when differing resistances
were used.
8.1.1 The Internal Resistance of a Battery
1.
2.
The internal resistance of the battery is approximately
0.4753 ohms.
3. The yintercept of this line, or E’=1.467.
4. The percentage difference from the actual EMF of the battery is (abs(1.470
1.467)/1.467)*100= 0.2045%
8.1.2 Batteries in Series I
1. V=EIr
r = {(VE)/I}
r = (4.25V4.44V)/0.1A = 1.9
Ω
2. E’ = E1+E2+E3 = 1.479V+1.479V+1.472V = 4.43V
3. Percent Difference = {abs(EE’)/E’}x100%
{abs(4.444.43)/4.43}x100% = 0.23%
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View Full Document4. Internal resistance combined (r) = 1.9
Ω
Individual battery resistance (1.9/3) = 0.63
Ω
0.4753
Ω
was what was found in 8.1.1, which differs by .15
Ω
which seems to be
consistent on how the resistance of the batteries also add up.
8.1.3 Batteries in Series I I
1. The combined total resistance of the batteries is 2.29 ohms.
2.
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 Spring '08
 Schwitters
 Physics, Current, Resistance

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