Interview
Electricity-physics
- Course
- Physical Sciences
- Institution
- 9
Simple notes that explains the concept of electricity in physics
[Show more]
Seller
Follow
Content preview
Electric cells● We use electric cells to supply the energy needed for electrons to move around an electric
circuit.
● The electric cell system works to generate electricity.
A cell does not have moving parts to generate electricity. An electrical cell generates electricity from
chemical reactions.
CHEMICAL REACTION WITH A LEMON
A chemical reaction takes place inside the lemon which produces electricity. The copper and zinc nails
(metal strips) are the electrodes and the lemon juice acts as the electrolyte.
➔ Citrus fruits (like lemons) are acidic, which helps their juice to conduct electricity.
When electrodes are connected in a circuit, a chemical reaction takes place within the electrolyte in
the lemon, which causes the electrons to move in the external circuit.
➔ This will only occur when the cell is connected in the circuit.
Chemical reactions only take place when the battery is connected in a circuit.
➔ When you store a battery for a long time, it won’t go flat.
RESISTANCE
An electric current is the rate of a charge flow in a closed circuit. The electrons in an atom are
arranged in the outer space around the central nucleus.
Resistance slows down the flow of current in an electric circuit.
● In metals, the electrons are able to move freely within the metal.
➔ We say electrons in a metal are delocalised.
● Conducting wires in electrical circuits are made of metal. If we supply a source of energy in a
complete circuit, the electrons will move in the same general direction through the wire to
the positive terminal of the battery. This movement of electrons is the electric current.
● Electrical conductors have some resistance.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ratilekola. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R63,00. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
69252 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 15 years now