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# Current electricity homework help

To test your understanding, determine the current for the following two situations. Note that some extraneous information is given in each situation. Click the Check Answer button to see if you are correct.

Static electricity often happens when you rub things together. If you rub a balloon against your pullover 20 or 30 times, you'll find the balloon sticks to you. This happens because rubbing the balloon gives it an electric charge (a small amount of electricity). The charge makes it stick to your pullover like a magnet , because your pullover gains an opposite electric charge. So your pullover and the balloon attract one another like the opposite ends of two magnets.

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When a charge is placed in a location with a non-zero electric field, a force will act on it. The magnitude of this force is given by Coulomb's law . Thus, if that charge were to move, the electric field would be doing work on the electric charge. Thus we can speak of electric potential at a certain point in space, which is equal to the work done by an external agent in carrying a unit of positive charge from an arbitrarily chosen reference point to that point without any acceleration and is typically measured in volts .

Electric currents cause Joule heating , which creates light in incandescent light bulbs . They also create magnetic fields , which are used in motors, inductors and generators.

Electricity can be dangerous, especially around water because water is a form of conductor as it has impurites like salt in it. Since the nineteenth century, electricity has been used in every part of our lives. Until then, it was just a curiosity seen in a thunderstorm .

A flow of positive electric charge. The strength of current flow in any medium is related to voltage differences in that medium, as well as the electrical properties of the medium, and is measured in amperes. Since electrons are stipulated to have a negative charge, current in an electrical circuit actually flows in the opposite direction of the movement of electrons. See also electromagnetism , Ohm's law. See Note at electric charge .

Alternating current describes the flow of charge that changes direction periodically. As a result, the voltage level also reverses along with the current. AC is used to deliver power to houses, office buildings, etc.

A lightning stroke is an example of a process involving "Static electricity". That is because there is a build up of electrical charge (electrons) in the clouds. Actually static electricity is not a very good name for this "type" of electricity because static means not moving, and lightning is a very dynamical event . The charges eventually move between the skies and the earth's crust , what is a very exciting journey

When children have not practiced enough they tend to make silly mistakes. Learnhive provides a large number of exercises to help them reduce these mistakes.

in newtons. Coulomb’s law describes mathematically the properties of the electric force between charges at rest. If the charges have opposite signs, the force would be attractive; the attraction would be indicated in equation ( 1 ) by the negative coefficient of the unit vector r̂. Thus, the electric force on Q 1 would have a direction opposite to the unit vector r̂ and would point from Q 1 to Q 2 . In Cartesian coordinates, this would result in a change of the signs of both the x and y components of the force in equation ( 2 ).

When an electric field is put on the wire, the electrons respond almost instantly by drifting slightly in the opposite direction of the field. They gain energy from the field, which is lost very quickly when they bump into other electrons in the material. As long as the field is in place, however, the electrons will gain back that energy that they lost, and the process will continue. This "jolt" that electrons receive from the electric field is the source of current, not the overall flow of electrons themselves. From this discussion, we can see two things that current is not :

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Current Electricity

Electricity - Wikipedia

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