P5 Electricity (Concept Map)
Primary 5 Science — Concept Map
Created by Miss Clarissa Ng · www.clartutors.com
Electric circuit
components connected together so current can flow
the components
Batteryenergy source · +ve and −ve terminals
Wiresthin strand of metal (copper)
Bulblight source · glass and metal
Switchcontrols the flow of current
Inside a wireA thin metal strand (copper) with a plastic covering
conductors vs insulators
Conductorssteel, copper, aluminium, graphite → bulb lights up
Insulatorswood, glass, plastic, rubber → bulb does not light up
Bulb lights = conductorif the bulb lights up, the object is a conductor
No light = insulatorno light means the object is an insulator
series vs parallel
Seriesone pathway · dimmer as bulbs are added · one fuses → all out
Parallelseparate pathways · brightness unchanged · others stay lit
More batteriesMore batteries in series → more current → brighter bulb
electricity in our lives
Conservationfan instead of air-con, switch off appliances
Safetyelectric shock and fires · no frayed wires
Electromagnetsmore current or more coils → stronger · electric bell
parts of a bulb
Four parts of a bulbglass casing, metal filament, metal tip, metal casing
Both ends must connectthe tip and the casing must both be connected
circuit symbols
Battery symbollong line = +ve terminal · short thick line = -ve
Switch on and offA closed switch lets current flow; an open switch stops it.
the electric bell
Closing the switchthe switch closes the circuit, so the electromagnets work
Hammer hits the gongthe iron strip is pulled, so the hammer hits the gong
Contact breaks the circuitthe contact stops touching the strip, so the circuit opens
Stronger magnetsMore current or more coils of wire = stronger magnet
closed and open circuits
Closed vs openClosed = no gaps, current flows · Open = a gap, no current