EMF and Internal Resistance Flashcards
1
Q
What is internal resistance?
A
- Collisions between electrons and the atoms inside the battery
- Causes energy loss
2
Q
What’s load resistance?
A
The total resistance of all the components in the external circuit
3
Q
What’s EMF?
A
The amount of electrical energy produced by the battery and transferred to each coulomb of charge
4
Q
What’s the equation for emf?
A
ε = E/Q
ε - EMF (V)
E - Energy (J)
Q - Charge (Q)
5
Q
What’s the terminal pd?
A
The potential difference across the load resistance
6
Q
What are lost volts?
A
Energy wasted per coulomb overcoming internal resistance
7
Q
What’s the equation linking emf, load resistance, internal resistance and current?
A
ε = I(R+r)
ε - EMF (V)
I - Current
R - Load resistance
r - Internal resistance
