Potential Difference + Resistance in circuits

Question 1

Potential difference

Answer 1

The push/voltage produced by a cell

Question 2

Colts

Answer 2

• Measurement of p.d

- symbol V

Question 3

Voltmeter

Answer 3

• measures the P.D of a component

- Must be placed in a parallel circuit or have a loop around the component

Question 4

Potential difference in a series circuit

Answer 4

• P.D is divided by the components

- total potential difference = sum of P.D throughout

Question 5

Potential difference in a parallel circuit

Answer 5

• P.D of each component is the same

- P.D of the cell would be the same as the P.D of one of the components

Question 6

What does P.D tell you

Answer 6

• the size of the force on the charges

- how much energy can be transferred to the components by charge

Question 7

Resistance + factors

Answer 7

• How difficult it is for the current to flow through the circuit
• some factors can be length, material, thickness

Question 8

Ohms

Answer 8

-measurement for resistance

Question 9

Resistance in a series circuit

Answer 9

• produced by electrical components
• total resistance is shared by components
• more components = more resistance
• Equation: R total = R + R + R

Question 10

Resistance in a parallel circuit

Answer 10

• more paths for current to flow through so it creates less total resistance
• equation: 1/R total = 1/R (1st component) + 1/R (2nd component) + 1/R (3rd component)

Question 11

Ohms Law

Answer 11

• states voltage across a component is directly proportional to the current flowing through it as long as as factors such as temperature remain consistent
• equation: V= IR