# data[].attributes.body
BBC BITESIZES

# data[].attributes.attachment_link.readable_text
A graph of current against shows you how the current flowing through a component varies with the potential difference across it.

The current flowing through a resistor at a constant temperature is directly proportional to the potential difference across it. This is called .

This is the graph of current against potential difference for a resistor at constant temperature:

When resistors are connected in series, the total of two or more resistors is the sum of their individual resistance.

When resistors are connected in parallel, the combined resistance of two or more resistors is less than that of either resistor by itself.

Potentiometers are variable resistors with a resistance control that is adjusted once and then fixed.

# data[].attributes.attachment_link.title
Voltage and current in resistors - Resistors, lamps and diodes - GCSE Physics (Single Science) Revision - BBC Bitesize

# data[].attributes.attachment_link.description
A graph of current against shows you how the current flowing through a component varies with the potential difference across it. The current flowing through a resistor at a constant temperature is directly proportional to the potential difference across it. This is called .

# data[].attributes.body
BBC BITESIZES

# data[].attributes.attachment_link.title
Electrical circuit symbols - Electric circuits - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise electrical circuits, charge, current, power and resistance with GCSE Bitesize Physics.

# data[].attributes.body
Electricity and circuits

# data[].attributes.attachment_link.readable_text
eHarcourtSchool.com has been retired and is no longer accessible. Because of the age of this application, the programs supported by this platform are not able to benefit from the technological improvements in accessibility, security, and HMTL5 (non-Flash) that we have incorporated into our newer programs and platforms in recent years.
Learn more about HMH's newest classroom solutions.
If you want to retrieve your user data from the platform that is no longer accessible, please contact techsupport@hmhco.com or 800.323.9239 and let us know that you're contacting us about user data extraction from eharcourtschool.com.

Please note, user data extraction does not include program content.

# data[].attributes.attachment_link.description
eHarcourtSchool.com has been retired and is no longer accessible. Because of the age of this application, the programs supported by this platform are not able to benefit from the technological improvements in accessibility, security, and HMTL5 (non-Flash) that we have incorporated into our newer programs and platforms in recent years.

# data[].attributes.body
KS2 Bitesize BBC

# data[].attributes.attachment_link.readable_text
| | |
|
| |
| | |
| |
| |
| | | | | | |

An interactive learning tool for Key Stage 2 Science (Units 4F and 6G)

developed by Andy Thelwell

Requires Macromedia Flash Player 6.

About this Site

# data[].attributes.attachment_link.title
The Blobz Guide to Electric Circuits (Coming soon!!)

# data[].attributes.body
New ks3 BBC

# data[].attributes.attachment_link.readable_text
All substances are made of . These are often called particles. An atom is electrically neutral - has no overall electrical . However, each atom contains even smaller particles called .

Each electron has a negative charge.

If an atom gains an electron, it becomes negatively charged.

If an atom loses an electron, it becomes positively charged.

Electrons can move from one substance to another when objects are rubbed together. You may have done this with a party balloon: if you rub a balloon on your sweater, you can get the balloon to stick to the wall or to your hair. This is because of .

Moving charges

When you rub two different materials against each other, they become electrically charged. This only works for electrically insulated objects and not with materials like metals, which conduct. For example, if you rub an acetate plastic rod with a duster:

electrons move from the rod to the duster

the duster becomes negatively charged and the rod becomes positively charged

The opposite thing happens with a polythene rod:

electrons move from the duster to the rod

the rod becomes negatively charged and the duster becomes positively charged

In both examples, the materials gain an equal amount of charge but the charges are opposite (one material becomes negative while the other becomes positive).

# data[].attributes.attachment_link.title
Positive and negative charges - Static electricity - KS3 Physics Revision - BBC Bitesize

# data[].attributes.attachment_link.description
All substances are made of . These are often called particles. An atom is electrically neutral - has no overall electrical . However, each atom contains even smaller particles called . Each electron has a negative charge. If an atom gains an electron, it becomes negatively charged.

# data[].attributes.headline
Electric current and potential difference

# data[].attributes.subject
Electric current and potential difference

# data[].attributes.body
New Ks3 BBC Bitesize

# data[].attributes.attachment_link.readable_text
Some particles carry an . In electric wires these particles are . We get an electric current when these charged particles move from place to place.

Electric current

An is a flow of charge, and in a wire this will be a flow of electrons. We need two things for an electric current to flow:

1. something to transfer energy to the electrons, such as a battery or power pack

2. a complete path for the electrons to flow through (an electric )

Electric circuits

The simplest complete circuit is a piece of wire from one end of a battery to the other. An electric current can flow in the wire from one end of the battery to the other, but nothing useful happens. The wire just gets very hot and the battery loses stored internal energy - it 'goes flat' and stops working.

To do something useful with the electric current, you need to put an electrical component into the circuit (such as a lamp), that can use the current in a useful way.

You usually add a switch to the circuit. This lets you break the circuit and stop the electric current when you want to.

# data[].attributes.attachment_link.title
Electric charge - Electric current and potential difference - KS3 Physics Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Some particles carry an . In electric wires these particles are . We get an electric current when these charged particles move from place to place. An is a flow of charge, and in a wire this will be a flow of electrons.

# data[].attributes.body
For kids

# data[].attributes.attachment_link.description
2021 Copyright. All Rights Reserved. The Sponsored Listings displayed above are served automatically by a third party. Neither the service provider nor the domain owner maintain any relationship with the advertisers. In case of trademark issues please contact the domain owner directly (contact information can be found in whois).

# data[].attributes.body
KS3 BBC Bitesize

# data[].attributes.attachment_link.readable_text
Most materials are not , but some are. A magnetic material can be magnetised or will be attracted to a magnet. These metals are magnetic:

Steel is mostly iron, so steel is magnetic too.

A bar magnet is a . This means that its magnetism is there all the time and cannot be turned on or off. A bar magnet has two magnetic poles:

Attract and repel

if you bring a north pole and a south pole together, they attract and the magnets stick together

if you bring two north poles together, or two south poles together, they repel and the magnets push each other away

We say that opposite poles attract, and like poles repel.

Testing for magnets

How can you test if a piece of metal is actually a magnet? Seeing if it sticks to a magnet is not a good test, because unmagnetised iron, steel, cobalt and nickel objects will also do this. So you can only show that an object is a magnet if it repels a known magnet.

# data[].attributes.attachment_link.title
Bar magnets - Electromagnetism and magnetism - KS3 Physics Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Most materials are not , but some are. A magnetic material can be magnetised or will be attracted to a magnet. These metals are magnetic: Steel is mostly iron, so steel is magnetic too. A bar magnet is a . This means that its magnetism is there all the time and cannot be turned on or off.

# data[].attributes.headline
Practical electrical and electronic circuits

# data[].attributes.subject
Practical electrical and electronic circuits

# data[].attributes.body
KS3 BBC Bitesize

# data[].attributes.attachment_link.readable_text
Position one: more than 0.1A, 0.1A or less than 0.1A

Position two: more than 0.1A, 0.1A or less than 0.1A

Position three: more than 0.1A, 0.1A or less than 0.1A

Position 1 = 0.1A

Position 2 = 0.1A

Position 3 = 0.1A

Remember that the charge moves all the way around the circuit.

# data[].attributes.attachment_link.title
Practical electrical and electronic circuits - Practical electrical and electronic circuits - National 5 Physics Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Position one: more than 0.1A, 0.1A or less than 0.1A Position two: more than 0.1A, 0.1A or less than 0.1A Position three: more than 0.1A, 0.1A or less than 0.1A Position 1 = 0.1A Position 2 = 0.1A Position 3 = 0.1A Remember that the charge moves all the way around the circuit.

# data[].attributes.body
Physic Electricity GCSE

# data[].attributes.attachment_link.title
Charge and current - Current, voltage and resistance - GCSE Physics (Single Science) Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Revise calculating current, measuring potential difference and energy transfer. Find out about charge, resistance and ohms law with BBC Bitesize.

# data[].attributes.body
Electric Power and energy

# data[].attributes.attachment_link.title
Cost of electricity - Electrical energy - GCSE Physics (Single Science) Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Revise how to calculate the cost of electrical energy which is used for heating and lighting with BBC Bitesize GCSE Physics.

# data[].attributes.body
GCSE BBC

# data[].attributes.attachment_link.title
Electrical symbols - Electrical circuits, AC and DC - GCSE Physics (Single Science) Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about the meanings of electrical symbols and properties of electrical circuits with BBC Bitesize GCSE Physics

# data[].attributes.body
Electric current and voltage Activity