Physics Key Stage 3 Lesson 3 Electricity and

Physics - Key Stage 3 Lesson 3 - Electricity and Magnetism Current & Parallel Circuits - Download Miss White 1

Slides from video 2

Investigating current in parallel circuits An ammeter was placed in 4 positions Source: Miss White 3

Investigating current in parallel circuits Describe the results Position Current (A) A 1 6. 00 A 2 3. 00 A 3 3. 00 A 4 6. 00 Explain what this tells your about current in parallel circuits 4

Fill in the missing value 1 Source: Miss White 4 2 ? 5

Fill in the missing value 2 Source: Miss White 10 5 ? 6

Fill in the missing value 3 Source: Miss White 8 ? 5 7

Fill in the missing value 4 Source: Miss White ? 7 6 8

More branches 1 Fill in the blank Position Current (A) A 1 15. 00 A 2 7. 00 A 3 4. 00 A 4 Source: Miss White 9

More branches 2 Fill in the blank Position Current (A) A 1 10. 00 A 2 2. 00 A 3 A 4 5. 00 Source: Miss White 10

More branches 3 Fill in the blank Position Current (A) A 1 A 2 4. 00 A 3 4. 00 A 4 6. 00 Source: Miss White 11

Independent Task Find the missing value and explain your answer Source: Miss White 12

Answers 13

Investigating current in parallel circuits - Answer The current is the same at A 1 and A 4 and the same at A 2 and A 3. A 2 + A 3 = A 1 or A 4 14 Position Current (A) A 1 6. 00 A 2 3. 00 A 3 3. 00 A 4 6. 00

Investigating current in parallel circuits In parallel circuits, the current entering the branches is equal to the current leaving the branches Position Current (A) A 1 6. 00 A 2 3. 00 A 3 3. 00 A 4 6. 00 Source: Miss White 15

Fill in the missing value - answers 1. (4 - 2 =) 2 A 1. (10 - 5 =) 5 A 1. (8 - 5 =) 3 A 1. (7 + 6 =) 13 A 16

More branches 1 - answers Fill in the blank Position Current (A) A 1 15. 00 A 2 7. 00 A 3 4. 00 A 4 4. 00 Source: Miss White 17

More branches 2 - answers Fill in the blank Position Current (A) A 1 10. 00 A 2 2. 00 A 3 3. 00 A 4 5. 00 Source: Miss White 18

More branches 3 -answers Fill in the blank Position Current (A) A 1 14. 00 A 2 4. 00 A 3 4. 00 A 4 6. 00 Source: Miss White 19

Independent task - answers Source: Miss White 2. 4 A - Current is the same everywhere in a series circuit 1. 2 A - Current is the same everywhere in a series circuit 3. 2 A - Total current leaving the cell equals the sum of the branches 20 4. 6 A - Total current is the sum of the branches in a parallel circuit