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Convection currents are caused by uneven heating of bodies of water/air, resulting in a current as hotter air/water rises, and cooler air/water sinks.
For example on a stove-top, when boiling water, the water at the bottom will warm first, being closest to the fire. Rising to the top, it will cool and sink to the bottom, creating a current.
That is why covering a pot is more efficient- when the hot water rises to the top due to a convection current, it cannot lose as much heat.
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What are the causes of crustal movements?
convenction!!
What causes the gobal convenction currerent between the equator and the poles?
the coriolis effect
What is the cause of a magnetic field about a current-carrying wire?
The cause is the current.
In a liquid can the heat transfer both by conduction and convection?
yes. it is conduction on the surface to begin with. later on, it is convenction
What is applied to a conductor to cause current flow?
voltage is applied to a conductor to cause a current flow
Can freezing cause a density current?
No, trade winds and evaporation can cause a density current but not freezing.
Does current or resistance cause breakers to trip?
Current.
Does warm air rise because of density?
Yes..Low density rises. As the particle gain more kinetic energy from being heated the density decreases as the particles move further apart causing a lower density. This could then form a convenction current but that is a different topic!
Can Magnetism cause an electric current to flow in a conductor?
Yes, a MOVING magnetic field will cause electric current to flow in a conductor. Conversely an electric current flowing in a conductor will cause a magnetic field.
Does the magnetic field increase or decrease if the current is decreased?
An increase in an electrical current will cause magnetism to increase but a decrease in an electrical current will cause magnetism to decrease.
How does voltage cause current to do work?
A voltage will cause electrons or other charge carriers to flow (if there is a path through which they can flow). In other words, it will cause a current.
How does a voltage cause current to do work?
A voltage will cause electrons or other charge carriers to flow (if there is a path through which they can flow). In other words, it will cause a current.
