Power Delivered To The Load

In summary, the problem involves a battery with 1.35V output voltage and 0.15 Ohm internal resistance being used to power a small electric motor with 285 Ohm resistance. By applying Ohm's Law, it is found that the power delivered to the motor is 0.00639W. Adding a second battery in series would double the output voltage and result in twice the power delivered to the motor. The key concept is understanding the relationship between voltage, resistance, and current in a series circuit.
  • #1
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1. Homework Statement

The battery has 1.35 V output voltage and 0.15 Ohm internal resistance. The battery is used to boot a small electric motor with 285 Ohm resistance. Find the power delivered to the motor. What the power will be if we use two batteries of this type in series?



3. The Attempt at a Solution

I thought the formula to use was

PL=VB2-(RL/(Ri+RL)2)

Ri= internal resistance
VB2=output voltage
RL=resistance

When I use this formula my answer is .00639W which is incorrect.
And I'm not sure how to do the second part of the problem

Any help on what I am messing up on would be appreciated.

Thanks
 
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  • #2
Don't look for complex formulae. This is pure Ohm's Law stuff.

The total resistance across the 1.35 Volts of the single battery is what?

(The internal resistance plus the motor resistance. They are in series.)

So, what current flows?

The motor has this current flowing in it and a known resistance, so what is the power delivered to the motor?

Now put another battery in series with the first one and do it again.
 

What is power delivered to the load?

Power delivered to the load refers to the amount of electrical energy that is transferred from a power source to the load, which is the device or system that is consuming the electricity.

How is power delivered to the load calculated?

Power delivered to the load is calculated by multiplying the voltage across the load by the current flowing through it. This is known as the power equation: P = VI.

What factors affect power delivered to the load?

Several factors can affect the power delivered to the load, including the voltage and current levels, the resistance of the load, and any losses in the power transmission system.

Why is power delivered to the load important?

Power delivered to the load is important because it determines how much electrical energy is available for the load to use. If the power delivered is too low, the load may not function properly. If it is too high, it can damage the load.

How can power delivered to the load be optimized?

To optimize power delivered to the load, it is important to use efficient power sources and minimize losses in the transmission system. Choosing the right voltage and current levels for the load can also help optimize power delivery.

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