What are the meter readings in the circuit?

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SUMMARY

The discussion focuses on calculating meter readings in a circuit using Ohm's Law (V = IR) and the equivalent resistance of resistors in parallel. The user calculated the currents A_1, A_2, and A_3 as 0.16A, 45A, and 30A respectively, based on a voltage of 12V and resistances of 75Ω, 20Ω, and 30Ω. However, there is confusion regarding the total equivalent resistance of the circuit, which should be calculated as 25Ω for the resistors in parallel. The correct formula for equivalent resistance in parallel is also sought.

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  • Knowledge of calculating equivalent resistance for resistors in parallel
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Homework Statement


http://img372.imageshack.us/img372/8240/1005200803ki4.png
What are the meter readings in the circuit on the top?

Homework Equations


[tex]V = IR[/tex]

The Attempt at a Solution



[tex]I = \frac{V}{R}[/tex]

[tex]A_2 = \frac{12}{\frac{20}{75}} = 45A[/tex]

[tex]A_3 = \frac{12}{\frac{30}{75}} = 30A[/tex]

[tex]A_1 = \frac{12}{75} = 0.16A[/tex]

Are my answers correct?
 
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I don't think your answers are correct. What is 75? Is it supposed to be total equivalence resistance of the circuit? If so, then that means the equivalent resistance of the resistors in parallel is 25 ohms, which is not right. What is the formula to find equivalent resistance of resistors in parallel?
 

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