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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.
What else can I help you with?
What are the causes of crustal movements?
convenction!!
What causes the gobal convenction currerent between the equator and the poles?
the coriolis effect
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.
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.
What forces cause current to move?
Voltage
A wire cannot cause a magnetic field if what?
A wire cannot cause a magnetic field if there is no current flowing through it. Magnetic fields are generated by the flow of electric current in a conductor.
What type of connection will cause an overload current?
A connection between the "hot" and the neutral will cause an over current condition. In electrical terminology this is known as a short circuit.
Does lightning cause the air to break down and cause current flow?
A: Lightning is not the cause but the result when clouds or dust particle containing energy discharges its energy. Current will flow from positive to negative potentials
