shinobi12 said:Homework Statement
trrttA battery has an emf of 15.0 V. The terminal voltage of the battery is 11.6 V when it is delivering 20.0 W of power to an external load resistor R.
(a) What is the value R?
(b) What is the internal resistance of the battery?
Homework Equations
The Attempt at a Solution
I'm sure how to start this problem. I'm sure I get rolling if I can just get some momentum started. Please Help.
Resistance is a physical property of a material that measures its ability to resist the flow of electricity. It is represented by the symbol "R" and is measured in ohms (Ω).
Resistance is calculated using Ohm's Law, which states that resistance is equal to the voltage (V) divided by the current (I). This can be represented by the equation R=V/I.
There are several factors that can affect resistance, including the material of the object, its length, cross-sectional area, and temperature. Generally, materials with high resistance have a longer length, smaller cross-sectional area, and higher temperature.
According to Ohm's Law, resistance and current have an inverse relationship. This means that as resistance increases, current decreases, and vice versa. This relationship is also known as Ohm's Law.
Resistance is an important factor in electrical circuits as it can affect the flow of current and the amount of voltage needed to overcome the resistance. High resistance can lead to a drop in voltage and a decrease in current flow, while low resistance can cause an increase in current flow and potential damage to the circuit.