Resistors in Series - summary
1. The total resistance of resistors in series
is their sum.
2. Current in a circuit is constant from the battery. If resistors are in series, they all have the same current as the battery delivers. Calculate this by:
3. The resistor voltages in a series circuit add up to the total battery voltage.
Example problem from class:
R1 = 1 ohm
R2 = 2 ohms
R3 = 3 ohms
If all 3 resistors are in series with a 12-V battery, the total current is 2-A. The individual resistor voltages are: 2-V, 4-V, and 6-V. Note that these add to 12-V.
Try this problem:
3 resistors (4, 5, and 3 ohms) in series with 36-V. Find the following:
- total resistance of the circuit
- current through each resistor
- voltage over each resistor
RTotal = R1 + R2 + …
2. Current in a circuit is constant from the battery. If resistors are in series, they all have the same current as the battery delivers. Calculate this by:
I = V/R
3. The resistor voltages in a series circuit add up to the total battery voltage.
Example problem from class:
R1 = 1 ohm
R2 = 2 ohms
R3 = 3 ohms
If all 3 resistors are in series with a 12-V battery, the total current is 2-A. The individual resistor voltages are: 2-V, 4-V, and 6-V. Note that these add to 12-V.
Try this problem:
3 resistors (4, 5, and 3 ohms) in series with 36-V. Find the following:
- total resistance of the circuit
- current through each resistor
- voltage over each resistor
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