Electricity Flashcards
Define the term ‘closed circuit’
Closed circuit means a complete electrical connection around which current flows or circulates.
Identify the part of an electric circuit in which electrical energy is changed into other useful forms of energy.
load device that uses electrical energy and converts it into other forms of energy. Eg a light bulb
Explain why metals are better conductors of electricity than non-metals.
Most metal objects are conductors of electricity because some electrons in the atoms of metals are free to move. When metal wires are connected to a power supply, free electrons in the wires move through the wires to create an electric current.
Explain WHAT a WATT is.
A watt is a measurement of the rate of transformation of power
ie how quickly electrical energy transforms into other forms of energy
Explain why a 50-watt globe glows more brightly than a 25-watt globe.
More electrical energy is being turned into light.
Identify which two particles of an atom carry electric charge.
Protons (positive) & electrons (negative)
When you rub a plastic ruler with a woollen cloth, the plastic ruler becomes negatively charged.
Describe what happens to the atoms in the cloth and ruler to cause this change
More electrons jump over to the ruler making it negatively charged as electrons are negative. The cloth has more protons than electrons and is positive.
Do opposite charges attract or repel each other
They attract.
Like charges repel
What is the release of built-up charge called?
Static electricity
How does static electricity work.
Electrons travel from a negative body to a positive or neutral body.
What is an ammeter?
A device that measures electric current, which is the rate of charge through a circuit. It is connected in series. Measured in ampseres or .amps or A
What is a voltmeter?
A device that measures
