E.M.F And Internal Resistance Flashcards
[………] have an Internal Resistance.
Batteries
Resistance in metals comes from electrons colliding with 1-[………] and 2-[………] energy
1-Atoms (or ions)
2-losing
In a battery what kind of energy does it use to make electrons move?
Chemical energy
What is Internal Resistance?
Is when electrons collide with atoms inside the battery creating a resistance
Internal resistance is what makes batteries and cells [……..][….] when they are used.
Warm up
We assume wires have […….] resistance.
Zero
What is Load resistance?
Is the total resistance of all the components in the external circuit, can also be called ‘external resistance’
How does a battery produce energy?
By chemical reactions
What is the Electromotive force or E.M.F?
The total amount of work the battery does on each coulomb of charge.
What is E.M.F measured in?
Volts
What is the E.M.F equation?
ε = W / Q
ε = W / Q What is W?
Is the work done on the charge.
What is the Potential Difference across the load resistance?
Is the work done when one coulomb of charge flows through the load resistance. Is called the ‘terminal P.D’
What would the the Terminal P.D equal if there was no internal resistance?
Terminal P.D would be the same as the E.M.F
What is the energy that is waged by overcoming the internal resistance called?
Lost Volts