Physics Progress Checkpoint about electricity 1/11/22

DR

- 00:00
- What is electrical resistance and how is it measured?
- 00:00
- Progress Checkpoint P4
- 00:06
- Key Question 1: What symbols are used to represent electric components?
- 00:23
- Key Question 2: How is charge calculated?
- 00:27
- To calculate the charge, you divide the work done in joules over a certain amount of time by the voltage.
- 00:31
- The Big Question: What is electrical resistance?
- 00:34
- What is meant by potential difference?
- 00:34
- The difference of electrical potential between two points.
- 00:34
- What is used to measure potential difference?
- 00:34
- A voltmeter.
- 00:34
- What are the units for potential difference?
- 00:34
- Potential difference is measured in volts.
- 00:38
- What is resistance in an electrical circuit?
- 00:38
- Resistance is a force that counteracts the flow of current.
- 00:38
- What causes resistance in an electrical circuit?
- 00:38
- Resistance is caused when the moving electrons collide with ions in the metal.
- 00:38
- What are the units for resistance?
- 00:38
- Resistance is measured in ohms with a symbol of: Ω
- 00:44
- How is resistance calculated?
- 00:44
- R = V ÷ I
- 00:44
- To calculate the resistance, you divide the voltage by the current.
- 00:49
- How can resistance be increased?
- 00:49
- The resistance in a wire can be increased by increasing the length of the wire or making the wire thinner.
- 00:49
- How can resistance be overcome?
- 00:49
- By using thicker wires to give the electricity more space to run.
- 00:54
- What is Ohm's law?
- 00:54
- According to BBCBitseize, Ohm's law states that 'the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions, such as temperature, remain constant.'
- 00:60
- THANKS FOR WATCHING