Chapter 10 - electrical circuits Flashcards
1
Q
what is kirchoffs second law
A
for any loop of a circuit, the sum of all p.d’s must be equal to the total EMF of the circuit
2
Q
resistance in series calculation
A
RT = R1 + R2 + R3..
3
Q
resistance in parallel calculation
A
1/RT = 1/R1 + 1/R2 + 1/R3..
4
Q
true or false, adding a resistor to a circuit in parallel will always reduce the total resistance
A
true - total resistance would decrease if there are more paths which the current can take
5
Q
how is potential difference of a component measured
A
voltmeter connected in parallel, over the component being measured
6
Q
define internal resistance
A
resistance within a power source due to the materials and components which make it up
7
Q
purpose of a potential divider
A
to provide variable p.d, or to provide a constant specific p.d.
