In this lesson, we covered the basics of electricity, including voltage, current, and resistance. Here's a recap:

- Voltage (V) is the pressure on a circuit supplied by a power source. It causes electrons to flow when the circuit is closed.
- Current (I) is the flow of electrons in a circuit. It is measured in amps (A) and flows through a load, such as a light bulb.
- Resistance (R) is the opposition to the flow of current in a circuit. It affects the current flow according to Ohm's law.
- Ohm's law states that the current in a circuit is directly proportional to the voltage and inversely proportional to the resistance (I = V/R).
- There are four major factors that affect resistance:
1. Type of material: Different materials have different resistivities. For example, copper has low resistance, while PVC has high resistance.
2. Cross-sectional area: Thicker conductors have lower resistance, allowing more electrons to flow.
3. Length of the conductor: Longer conductors have higher resistance, so thicker cables are preferred to reduce resistance.
4. Temperature: Higher temperatures increase resistance, as seen in the example of a light bulb filament.

We also discussed how to measure current using an ammeter and showed practical examples of calculating resistance using Ohm's law. Additionally, we observed the effects of resistance on a globe's resistance when it was cold and hot.