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<aside> 💡 KEY TERMS - for revision

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Introduction to non-contact forces

what is a circuit

circuit: pathway for electricity to flow through

• cannot be broken, or else electricity won’t flow through

electrons: a very small subatomic particle with an electric charge

conductor: a material that electricity flows through very easily

• metals

what is an electric current

electric current: a flow of electrons through a circuit

electromagnet: an object that is magnetised when electricity flows through it

unit of measurement

ampere (A): amp for short, is the unit of measurement for electric current

• used to measure the amount of charge flowing through a circuit

• 1 amp means about 6,241,000,000,000,000,000 passing through point in circuit every second

• circuit needs to have power source (e.g. battery) for current to flow, higher the current, the more energy

how to draw circuit

component: parts of an electric circuit

each component of a circuit has unique symbol

• positive end of the battery is twice the length of negative end as + sign as double amount of lines as - sign

switch: component that controls whether or not electrons can flow through a circuit

current can only flow through circuit when the switch is closed

if the switch is opened, the pathway for electrons is broken

what every circuit must have