Electric circuits

Requirements for current to flow

1. Requirements for current to flow: Practical 11'28"

2. Short circuits and broken circuits 6'38"

Components and diagrams

1. Analogy 2'37"

2. Components 2'20"

3. Telling series and parallel circuits apart 6'30"

4. Effect of breaking series / parallel circuits at various places 16'04"

Batteries and bulbs

1. Terms 6'12"

2. Cells and brightness 6'35

3. Cells in series 7'55"

4. Cells in parallel 8'43"

5. Comparison: cells in series & parallel 1'46"

Variables and their measurement

1. Measuring V and I in a circuit with a bulb: Practical 7'18"

2. Measuring R in a circuit with an LED: Practical 9'14"

3. Measuring V and I in a circuit with an LED: Practical 5'54"

Factors affecting resistance

1. Terms 10'29"

2. Length 15'53"

3. Thickness 12'35"

Measuring V,R and I

1. Measuring V and I in a circuit with a bulb: Practical 7'18"

2. Measuring R in a circuit with an LED: Practical 9'14"

3. Measuring V and I in a circuit with an LED: Practical 5'54"

EMF and Potential Difference

1. EMF and Terminal potential difference: Practical 7'32"

2. Potential and potential difference 5'56"

3. Cells in series 7'55"

4. Cells in parallel 8'43"

5. Comparison: cells in series & parallel 1'46"

Current

1. Current flow 5'26"

2. Current direction 2'37"

3. Current strength 2'11"

Resistance

1. Resistance 5'09"

2. Equivalent resistance and fractions of resistance 4'25"

Adding resistors in series

1. Terms 3'77"

2. Investigation 9'06"

3. Adding resistors in series 7'38"

Position and current strength

1. Position and current strength 6'37"

2. Current strength at various positions in a series circuits 5'30"

Resistance and current strength

1. Terms 4'56"

2. Basic investigation 12'06"

3. Extended investigation 9'34"

Potential difference and current strength

1. Basic investigation 11'46"

2. Extended investigation 13'18"

3. Voltage changes: Series circuit 9'59"

Potential difference across components in series circuits

1. Single circuit 13'15"

2. Circuits with same R ratios 14'53"

3. Current strength at various positions in a series circuits 5'30"

4. Resistance in series circuits 7'37"

5. Measurement of potential difference for series circuits 7'57"

6. Potential difference for series circuits 9'59"

Position and current strength

1. Position and current strength 6'37"

Resistance and current strength

1. Terms 4'56"

2. Basic investigation 12'06"

3. Extended investigation 9'34"

Cells in series

1. Cells and brightness 6'35"

Potential difference and current strength

1. Terms 6'12"

2. Basic investigation 11'46"

3. Extended investigation 13'18"

Potential difference across components in series circuits

1. Single circuit 13'15"

2. Circuits with same R ratios 14'53"

Worked examples

1. Ammeter in a series circuit 1'21"

2. Current and position in a series circuit 2'23"

3. Connecting a circuit correctly 1'30"

4. Current strength comparison 2'21"

5. Current strength comparison explanation 1'40"

6. Potential difference across components in a series circuit: Part 1 4'59"

7. Worked example: Potential difference across components in a series circuit: Part 2 3'38"

Parallel circuits

1. Measuring current strength in parallel circuits 5'16"

2. Current strength in the main part of a parallel circuit 6'19"

3. Resistance in parallel circuits 5'01"

4. Potential difference and current strength in parallel circuits 7'18"

Bulb brightness

1. Adding resistors in parallel 17'07"

Current strength

1. Position and current strength 17'21"

2. Equivalent resistance and current strength 13'37"

Voltage

1. Potential difference across parallel branches 15'46"

Worked examples

1. Ammeter readings in main and branched sections of a parallel circuit 2'15"

2. Potential difference across bulbs in main and branched parts of a parallel circuit 7'29"

3. Adding resistors in parallel 4'54"

4. Parallel circuit question Part 1: Introduction 8'03

5. Parallel circuit question Part 2: Current strength 47"

6. Parallel circuit question Part 3: Current strength in branch 1'11"

7. Parallel circuit question Part 4: Resistance 53"

8. Parallel circuit question Part 5: Potential difference 3'31"

9. Parallel circuit question Part 6: Current dividers 1'26"