Circuit Foundations
Circuit Foundations
Basics of Electrical Circuits
- Understand that an electrical circuit is an uninterrupted path for electricity to flow, composed of a power source, conductive path, and a device such as a lamp that operates on electrical power.
- Learn that voltage (V) is the electrical force that drives an electric current between two points, while current (I) represents the rate at which electrical charge flows, measured in Amperes (A).
- Remember that resistance (R), measured in Ohms (Ω), opposes the flow of current.
Series and Parallel Circuits
- Get to grips with series circuits where components are arranged end-to-end, current is the same across all components, but voltage divides in direct relation to the resistances.
- Learn about parallel circuits where components are side-by-side, voltage remains constant, but the current is divided across components.
- Understand that if one component in a series circuit fails, the circuit breaks, but in parallel circuits, other components continue to function.
Ohm’s Law
- Remember that Ohm’s Law defines the relationship between voltage, current, and resistance in an electrical circuit, expressed by the formulae V=IR.
- Understand the implications of Ohm’s Law on circuit design and function.
Measuring Electricity
- Learn to measure current in series using an ammeter, introduced into the circuit itself.
- Understand that voltage is measured in parallel with the component using a voltmeter.
- Learn how to utilise a multimeter to measure resistance, current, and voltage.
Conducive and Insulating Materials
- Know the difference between conductors (materials that permit free movement of electrons and thus, electricity) and insulators (materials that restrict electron movement).
- Remember common conductors encompass silver, copper, and aluminium while common insulators include rubber, glass, and plastic.
- Learn the purpose of resistors in controlling current flow within circuits to protect components from damage.
Electrical Power and Energy
- Understand that electric power (measured in watts, W) is product of voltage and current (P=VI). It is the rate at which electrical energy is transferred or converted.
- Learn that electrical energy (measured in joules, J) is the work done in moving a charge in the presence of an electric field.
- Grasp the concept of efficiency, the proportion of electrical energy converted into useful output power.