Solve Electric Current & Find E, I & Power Loss

[Phemzy]

Homework Statement

In the circuit below, find
(1) The total current in the circuit
(2) The battery voltage E
(3) The power loss in the 20ohms resistor

Homework Equations

V=IR

The Attempt at a Solution

I=I₁+I₂
V=30I₁ and V=40I₂
30I₁ = 40I₂
or
V-30I₁ = V-40I₂

 

[rl.bhat]

Hi Phemzy, welcome to PH.
Please check the problem again. To solve the problem, they must give a current in anyone branch.

 

[Phemzy]

Hi rl.bhat,

That is how the lecturer gives us the assignment.

No additional information was given

Some of my course mate said, we should use Kirchoff's rule.

 

[gneill]

Without a specific value for the battery voltage or a branch current or *something* to tell you how much energy is moving in the system, the best you can do is to find the answers symbolically.

 

[rwisz]

I would approach this problem by first organizing the given information and identifying the variables involved. From the circuit, we can see that there are two resistors, a battery, and a total current flowing through the circuit. The equations V=IR and P=IV can be used to solve for the unknown variables.

To find the total current, I would use Ohm's Law (V=IR) to calculate the individual currents through each resistor. Then, I would add these currents together to find the total current in the circuit.

Next, I would use the equation V=IR again to find the battery voltage. This can be done by setting the voltage across each resistor equal to the total voltage of the battery.

Finally, to find the power loss in the 20ohms resistor, I would use the equation P=IV, where P is power, I is current, and V is voltage. By plugging in the known values, I can solve for the power loss in the resistor.

In summary, as a scientist, I would approach this problem by using known equations and principles to solve for the unknown variables. This method allows for a systematic and accurate solution to the problem.