# Topic: Fundamentals of Circuits

## 2.01 use the following units: ampere (A), coulomb (C), joule (J), ohm (Ω), second (s), volt (V) and watt (W)

unit for:

current : Ampere (A)

charge : coulomb (C)

resistance : ohm (Ω)

time : second (s)

potential difference : volt (V)

power : watt (W)

2022-11-29T14:27:12+00:00Categories: 2 Electricity, 2(a) Units, Edexcel iGCSE Physics, Uncategorized||

## 2.04 know and use the relationship between power, current and voltage: and apply the relationship to the selection of appropriate fuses

power (w) = current (A) x voltage (V)

when looking at a circuit a component will be given a power and a voltage appropriate to run at then the current can be calculated so the rating of the fuse can be selected for slightly higher than that.

## 2.07 explain why a series or parallel circuit is more appropriate for particular applications, including domestic lighting

• Components (e.g. bulbs) may be switched on/off independently.
• If one component breaks, current can still flow through the other parts of the circuit.
• Bulbs maintain a similar brightness.

• Fewer wires, cheaper and easier to assemble.
• Uses less power

## 2.09 describe how current varies with voltage in wires, resistors, metal filament lamps and diodes, and how to investigate this experimentally

in the bellow diagram the red box could represent a wire, a bulb, a resistor or a diode.

By changing the resistance of the variable resistor the graphs are reproduced.

## 2.22 identify common materials which are electrical conductors or insulators, including metals and plastics

Conducting Materials:

• Copper
• Aluminium
• Gold
• Silver

Will conduct electricity

Insulating Materials:

• Glass
• Air
• Plastic
• Rubber
• Wood

Will not conduct electricity

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Section 1: Principles of chemistry

a) States of matter

b) Atoms

c) Atomic structure

d) Relative formula masses and molar volumes of gases

e) Chemical formulae and chemical equations

f) Ionic compounds

g) Covalent substances

h) Metallic crystals

i) Electrolysis

Section 2: Chemistry of the elements

a) The Periodic Table

b) Group 1 elements: lithium, sodium and potassium

c) Group 7 elements: chlorine, bromine and iodine

d) Oxygen and oxides

e) Hydrogen and water

f) Reactivity series

g) Tests for ions and gases

Section 3: Organic chemistry

a) Introduction

b) Alkanes

c) Alkenes

d) Ethanol

Section 4: Physical chemistry

a) Acids, alkalis and salts

b) Energetics

c) Rates of reaction

d) Equilibria

Section 5: Chemistry in industry

a) Extraction and uses of metals

b) Crude oil

c) Synthetic polymers

d) The industrial manufacture of chemicals

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