PHYS 102 Lecture Notes - Lecture 14: Provatas, Voltage, Internal Resistance

• School: McGill University
• Department: Physics
• Course: PHYS 102
• Professor: Nick Provatas

Document Summary

Emfs in series and parallel - charging a battery: emfs in series in the same direction. Typical layout to add up voltages for use in a device. Batteries add up their voltage and lead to larger current through resistor - high current. however, dissipates more internal energy through their internal resistance. 1. 5v - ir + 1. 5 v - ir - ir = 0. Physics 102 (provatas) - t/r 11:35-12:55: emfs in series, opposite direction. 20v - ir - ir - 12v = ir. Battery of smaller voltage is being charged. Physics 102 (provatas) - t/r 11:35-12:55: emfs in parallel. Typical for producing more current than a single emf. Suffer less internal resistance this way with the same voltage (current split between two branches: examples in real life. Jump starting a car - jumper cables connect the good battery and the weak battery in parallel for charging! Putting capacitors in circuit: combinations of capacitors.