Robots need electricity to function. Electrical systems power motors, carry signals, control switches, and help the robot turn commands into real movement. When students understand power, circuits, and components, the robot becomes easier to build, troubleshoot, and improve.
Electrical power is what gives a robot the energy to move, switch, sense, and respond.
A robot's controller sends electrical signals that turn parts on, change direction, and adjust speed.
AC and DC are two different types of electrical power. Both can be useful, but they are used in different places inside buildings, machines, and robots.
Alternating current changes direction back and forth many times per second. It is the type of power used in most buildings.
Direct current flows in one direction. Robots often use DC power because batteries provide DC electricity.
A circuit is a closed path that allows electricity to flow. In a robot, circuits connect power sources, switches, controllers, sensors, and motors so the system can do useful work.
In a series circuit, electricity has one path to follow. If one part opens or fails, the whole circuit stops working.
In a parallel circuit, electricity has more than one path. If one path opens, another path can still keep working.
Voltage is the electrical push that moves charge through a circuit. Current is the flow of that charge. Engineers label both because they show how much power is available and where the electricity is moving.
Voltage is measured across parts of a circuit. A robot battery might provide the voltage that pushes current toward a motor.
Current is measured through a path. More current usually means more electrical flow, which can make a motor work harder.
Electrical components are the building blocks inside a robot's power and control system. Each part has a job, and together they help the robot use electricity safely and correctly.
A resistor limits or controls the amount of current flowing through part of a circuit. It helps protect components from too much electrical flow.
A switch opens or closes a circuit. When the switch is closed, current can flow. When it is open, the circuit stops.
A relay is an electrically controlled switch. A small control signal can use a relay to turn a larger circuit on or off.
A motor changes electrical energy into motion. Robots use motors to spin wheels, move joints, turn belts, or position tools.
Motor control means deciding when a motor runs, which direction it turns, and how fast it moves. A controller, switch, relay, or motor driver can send the electrical commands that make this happen.
The circuit can close to let current reach the motor, or open to stop current and turn the motor off.
Reversing the electrical polarity can make many DC motors spin the opposite direction.
A controller can change how much power reaches the motor, which changes how fast the motor spins.
Good motor control keeps the robot from drawing too much current, overheating parts, or moving unexpectedly.
A schematic is an electrical drawing that uses symbols and lines to show how parts connect. Engineers use schematics because they make a circuit easier to build, explain, test, and repair.
A schematic is not usually a realistic picture of the parts. It is a map that shows electrical relationships using symbols, labels, and connection lines.
Engineers use schematics to plan circuits, find mistakes, explain designs to a team, and troubleshoot when a robot does not behave correctly.
A mobile robot connects many electrical ideas in one system. The battery provides DC power, the controller sends signals, motor drivers manage current, and the motors turn the wheels so the robot can move.
When the robot receives a command to drive forward, the controller tells the motor driver how much power to send. The driver sends controlled DC power to each motor, and the wheels rotate.
Electrical and electronic systems give robots power and control. AC can power buildings and chargers, DC can power robot batteries, circuits create paths for electricity, components manage that electricity, and motor control turns commands into movement.
These definitions explain the most important electrical words used throughout this robotics systems page.
Electrical current that repeatedly changes direction. AC power is commonly used in buildings and wall outlets.
Electrical current that flows in only one direction. DC power is commonly supplied by batteries and used in robots.
The electrical force or pressure that pushes electric current through a circuit.
The flow of electrical charge through a wire or circuit.
The amount a material or component slows down or limits the flow of electrical current.
A closed path that allows electricity to travel through connected electrical components.
An electrically controlled switch that uses a small electrical signal to turn a larger circuit on or off.