- #1
butterflycandy
- 1
- 0
- Homework Statement
- nevermind
- Relevant Equations
- V=IR
Completely lost :(
hutchphd said:This may be difficult to answer without more info.
When I first replied, there was a problem statement about an electrical appliance that consumes 800 W when connected to a 120 V outlet in Canada. The question was how much power it would consume in the UK where the outlets are 240 V. There were five choices, all in kW, which I don't remember except for the correct one which can be easily reconstructed and "zero" which means that Canadian appliances in the UK would be useless.DaveE said:me too. what's your question?
Electromagnetism is a branch of physics that studies the relationship between electric fields and magnetic fields. It describes how electric charges produce electric fields, how moving charges produce magnetic fields, and how these fields interact with each other and with matter.
Electric fields and magnetic fields are interrelated aspects of a single phenomenon known as the electromagnetic field. According to Maxwell's equations, a changing electric field can produce a magnetic field, and a changing magnetic field can produce an electric field. This relationship is the basis for electromagnetic waves, such as light.
Maxwell's equations are a set of four fundamental equations that describe how electric and magnetic fields are generated and altered by each other and by charges and currents. They are: Gauss's law for electricity, Gauss's law for magnetism, Faraday's law of induction, and Ampère's law with Maxwell's addition.
Electromagnetic induction is the process by which a changing magnetic field creates an electric current in a conductor. This principle is the basis for many technologies, including electric generators and transformers. Faraday's law of induction quantifies this effect, stating that the induced electromotive force is proportional to the rate of change of the magnetic flux.
Electromagnets work by using electric current to generate a magnetic field. When an electric current passes through a coil of wire, it creates a magnetic field around the coil. The strength of the magnetic field can be increased by adding more turns to the coil or by increasing the current. Electromagnets are widely used in various applications, including electric motors, transformers, and magnetic storage devices.