electromagnetic science

Electricity

Flow of electrical energy

Electrical Energy

Occurs due to flow of electrons in conductor

Same charges

repel

different charges

attract

Static Electricity

Result of imbalance between positive and negative charges in object

Electricity Occurs Naturally In:

lightning, static electricity, living things (bio electricity)

Sources of electricity

fossil fuels, hydro, nuclear, geothermal, solar, wind

Circut

connection of components that allows electrons to flow

Requirements of circuts

complete loop, power source

direction of current

negative to positive

Current Symbol

I

Current unit

Amps or A

Voltage symbol

V

Voltage unit

volts or V

resistance symbol

R

Resistance unit

ohms or Ω

Ohms law

R=V/I I=V/R V=IxR

Series circuts

components connected in one loop (end to end), current has one pathway

Parallel circuts

components connected side by side, current has multiple pathways

Ammeter

measures current, connected in series

voltmeter

measures voltage, connected in parallel

parallel voltage with constant resistance

same

series voltage with constant resistance

cell=L1+L2

series current with constant resistance

same

parallel current with constant resistance

between battery and L1=between bulbs

current and voltage with constant resistance

increase and decrease together

in series when resistors added

voltage drop, current decrease

in parallel when resistors added

current increase

electrical quantity maximised by parallel

total current

voltage drops

when voltage flows through something that resists flow of electricity

voltage measure of

energy difference between 2 locations

increase accuracy

using stable equipment, account for wires

advantage of parallel over series

if one part breaks, others still work

What symbol is this?

cell

What symbol is this?

battery

What symbol is this?

open switch

What symbol is this?

closed switch

What symbol is this?

lamp/bulb

What symbol is this?

buzzer

What symbol is this?

ammeter

What symbol is this?

voltmeter

What symbol is this?

motor

What symbol is this?

variable/load/resistor

What symbol is this?

wire