Resistors in series and in parallel

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SUMMARY

The discussion focuses on calculating voltage, resistance, and current in a circuit with resistors in series and parallel configurations. The user calculated total resistance as 77.92 ohms and total current as 1.54A using a 20V battery. The voltage across individual resistors was determined, with specific values for 19 ohm, 24 ohm, and 32 ohm resistors. The voltage across parallel resistors was clarified, emphasizing that it remains constant and is derived from the total current multiplied by the resultant resistance.

PREREQUISITES
  • Understanding of Ohm's Law (V=IR)
  • Knowledge of series and parallel resistor configurations
  • Ability to calculate equivalent resistance for series and parallel circuits
  • Familiarity with basic electrical circuit analysis
NEXT STEPS
  • Study the calculation of equivalent resistance in complex circuits
  • Learn about Kirchhoff's laws for current and voltage in circuits
  • Explore the concept of power in electrical circuits (P=VI)
  • Investigate the use of multimeters for measuring voltage and current in circuits
USEFUL FOR

Electronics students, hobbyists working on circuit projects, and anyone interested in understanding resistor behavior in electrical circuits.

Moninder
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v0ynsWi.jpg


!20V battery.I need to Find Voltage, Resistance and Current in all resistors and total.
This is what I did so far.
Added 13ohms +15 ohms, then took all 3 of those and made it into one, whihc gave me 7.2258ohms.
Did the same for the 72 and 45 to get 27.7 ohms.
Then found the total resistance as 77.92 ohms. Found I total , current to be 1.54A
And for the 19ohm resistors I got V=29.26V I=1.54A
For 24ohm, V=36.96 I=1.54A
And I think for the 32 ohm V=29.26 I=0.91A
For 72ohm and 45 ohm V=27.7ohm and if that is it, should total current equal 1.54 instead of 0.88A?
 
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Moninder said:
v0ynsWi.jpg


!20V battery.I need to Find Voltage, Resistance and Current in all resistors and total.
This is what I did so far.
Added 13ohms +15 ohms, then took all 3 of those and made it into one, whihc gave me 7.2258ohms.
Did the same for the 72 and 45 to get 27.7 ohms.
Then found the total resistance as 77.92 ohms. Found I total , current to be 1.54A
And for the 19ohm resistors I got V=29.26V I=1.54A
For 24ohm, V=36.96 I=1.54A
And I think for the 32 ohm V=29.26 I=0.91A
For 72ohm and 45 ohm V=27.7ohm and if that is it, should total current equal 1.54 instead of 0.88A?

How did you get the voltages in red?

The voltage is the same across all parallel connected resistors. It is equal to their resultant multiplied by the total current. The voltage across the 32 Ω resistor is the same as the voltage across the parallel resultant: 7.226*1.54. Dividing this voltage by the individual parallel resistances, you get the currents.

ehild
 

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