Ch10 Flashcards
What does Kichhoof second law say?
In any circuits the sum of the electromotive forces is equal to the sum of the p.d.s. around a closed loop. It basically says that the total energy transferred to the charges in a circuit is always equal to the total energy transferred from the charge as they move around the circuit.
SUM E = SUM V around a closed loop
What characterises a series circuit?
It has only one path for the current
How is the current in a series circuit?
The same in every position
How is the emf in a series circuit in relation to its components?
In a series circuit, the emf is split across all components depending on their resistance. If the resistance is the same, the emf is shared equally. If the components have different resistance, the components with the greater resistance will take a greater proportion of the emf
The sum of the voltages is equal to the total e.m.f of the power supply
How is emf shared among components in circuits with more than one source of e.m.f.
The e.m.f from each source needs to be added before sharing. The sources of e.m.f. are connected with opposing polarities. For example E1 = 9V and E2 = 6V. we need to do 9-6 = 3V the sum of e.m.f. is 3 not 15V
What characterises a parallel circuit?
There is more than one possible path for the charges
What factor affects how much charge flows down a path in a parallel circuit?
The resistance of the path. The greater the resistance the lower the current that passes through it.
