What is Internal resistance: Definition and 157 Discussions
A practical electrical power source which is a linear electric circuit may, according to Thévenin's theorem, be represented as an ideal voltage source in series with an impedance. This impedance is termed the internal resistance of the source. When the power source delivers current, the measured voltage output is lower than the no-load voltage; the difference is the voltage drop (the product of current and resistance) caused by the internal resistance. The concept of internal resistance applies to all kinds of electrical sources and is useful for analyzing many types of electrical circuits.
A battery of e.m.f. 4.5V is connected across a 12 ohm resistor, if the Pd. Across the resistor is 3V calculate
a)the current in the circuit ?
b)internal resistance of the battery?
iv tried my best but i can't do it
I'm doing an experiment to measure the internal resistance of a zinc carbon cell (battery) and have slightly confused myself! Do I use the ε= IR + Ir formula? And if so how in the world do I use it! I know that I can work out R by using V and I values but how do I find the EMF of the battery...
The answer to the attachment is if the R resistance was equal to the internal resistance. How was this determined? Please explain this to me because i have no idea how they can solve this. Thanks
Hey I am confused as to the answer to this question; not sure exactly how to figure out what the answer is because it is not a constant resistance. Any help appreciated:
The potential difference across the terminals of a battery is V_1 when there is a current of I_1 in the battery from the...