Determine the magnitude of the current in the circuit

In summary, the formula for determining the magnitude of current in a circuit is I = V/R, where I is the current in amperes, V is the voltage in volts, and R is the resistance in ohms. To measure voltage, a voltmeter is needed and for measuring resistance, an ohmmeter is required. The unit of measurement for current is amperes (A). In a series circuit, the magnitude of current remains the same at every point, while in a parallel circuit, the current is divided among the branches based on their resistance.
  • #1
dedra73
2
0
This is a problem I had for homework. I want to make sure I did it correctly.

http://i90.photobucket.com/albums/k256/dedra73/circuit-2.jpg

circuit-2.jpg



(a) Determine the magnitude of the current in the circuit and
I = (30-10)V / (27+5+8+12)Ω
=20V/52Ω
=.3846A

(b) The magnitude of the voltage between the points labeled A and B.
Vab = 30V - .3846A * 27Ω
= 30V- 10.3842V
= +19.6158V

(c) State which point, A or B, is at the higher potential.
Point B is 19.6158V higher than A
 
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  • #2
Looks good to me!
 

1. What is the formula for determining the magnitude of current in a circuit?

The formula for determining the magnitude of current in a circuit is I = V/R, where I is the current in amperes, V is the voltage in volts, and R is the resistance in ohms.

2. How do I measure the voltage and resistance in a circuit?

To measure voltage, you will need a voltmeter. Place the two probes of the voltmeter across the component or circuit element you want to measure. To measure resistance, you will need an ohmmeter. Connect the ohmmeter leads to the two points where you want to measure the resistance.

3. What is the unit of measurement for current?

The unit of measurement for current is amperes (A).

4. How does the magnitude of current change in a series circuit?

In a series circuit, the magnitude of current remains the same at every point in the circuit. This means that the current flowing through each component is equal.

5. How does the magnitude of current change in a parallel circuit?

In a parallel circuit, the magnitude of current is divided among the branches based on the resistance of each branch. This means that the total current entering a junction will be equal to the sum of the currents in each branch.

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