Voltage, Current & Resistance

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Current in an electric circuit is measured with an instrument called an _____.


When current is measured, the ammeter is connected so that it becomes part of the _____.


The opposition to current flow in an electrical circuit is called _____.

OHM’S LAW: If any two electrical characteristics are known, you can determine the third with Ohm’s Law.

The law that defines the relationship between current, voltage and resistance is called _____ Law.


According to Ohm’s Law, the current in any circuit is _____ proportional to the applied voltage.

A meter used to measure electric current. It is connected as part of a circuit.


The unit of measurement of electric current. One ampere is one coulomb per second.


A complete path allowing current to flow.

Closed circuit

A material that gives up free electrons and offers only slight opposition to current flow.


The movement of free electrons in a material.


The force that causes electrons to move through a conductor.

Electromotive Force (emf)

Electrons in the outer orbits of an atom that can easily be forced out of their orbits.

Free Electrons

A material that does not give up free electrons easily and offers opposition to current flow.


The basic unit of resistance measure.


A meter for directly measuring the resistive component of an electrical circuit.


A circuit with a break or open path that stops current flow.

Open circuit

The term most frequently used to express the difference of potential between two charges or between two points of a circuit.


A meter that is connected across the line to measure the potential difference (voltage) between two points.


The property of a circuit which limits, opposes or resists the flow of electricity through it.


The resistance of a conductor is measured in a unit called…


E = I x R

When the current (I) and resistance (R) are known, the voltage (E) can be found by the formula.


(P) or (W) means?


(V) or (E) means?

Current, Amp or Amperage

(I) means?

Ohms or Resistance

(R) means?

The instrument used to measure difference in electrical potential is called a _____.


Materials that have few free electrons are called _____.


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