Resistance And Circuits

Question 1

Total resistance in series equation

Answer 1

R = R1 + R2 + ….

Question 2

Total resistance in parallel

Answer 2

1/Rt = 1/R1 + 1/R2 + ….

Question 3

Potential divider equation

Answer 3

Vout = Vin (R2/(R1+R2))

Question 4

E =

Answer 4

I(R+r)

V+Ir

Question 5

EMF

Answer 5

Work done per unit charge on charge carriers transferring energy from chemical to electrical

Question 6

Internal resistance

Answer 6

Resistance of components inside the battery, which transfers some energy as thermal, heating the battery. The lost volts per unit current

Question 7

Terminal potential difference

Answer 7

Potential difference across the terminals of a battery

Question 8

Resistance =

Answer 8

pL/A

Question 9

Determining the maximum power available from an electrical source procedure

Answer 9

1. With no load connected to the cell, measure the terminal potential difference
2. Add a single lamp bulb and record the terminal potential difference across the cell and the total current flowing from the cell
3. Add additional lamps in parallel and record the terminal p.d. Of the cell and total current from the cell.

Question 10

What do potential dividers do?

Answer 10

• it can reduce a large voltage to a specific small value

- used to build sensors which vary their resistance depending on the surroundings

Question 11

Potential divider

Answer 11

A circuit with two resistances connected in series, so that the p.d is shared between the resistors