Electrical systems contain 3 blocks.
INPUT --> PROCESS --> OUTPUT
Between each block there is a signal. Each block changes the signal in some way.
- Input devices: switches, LDRs, thermistors.
- Process devices: timer, amplifiers, pulse generators.
- Output devices: bulbs, motors, buzzers.
Conductors are used to connect up the components in an electrical circuit because they allow electricity to flow through them. They have a low resistance. Copper is a good conductor.
Insulators often surround conductors so people don't get electric shocks or so the circuit doesn't short circuit. They don't allow electricity to flow through them and have a hogh resistance. PVC is a good conductor.
Resistors are used to reduce the current in a circuit to protect delicate components from damage