# Voltage, Current & Resistance

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### Current moves through a conductor at the speed of _____.

LIGHT: Approximately 186,000 miles per second.

AMMETER

CIRCUIT

POLARITY

RESISTANCE

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

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

DIRECTLY

### Two meters that can measure electrical resistance are the _____ and _____.

OHMMETER & MEGOHMMETER: The ohmmeter measures circuit resistance; the megohmmeter measures the high resistance of insulation.

### Ammeter

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

### Ampere

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

### Closed circuit

A complete path allowing current to flow.

### Conductor

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

### Current

The movement of free electrons in a material.

### Electromotive Force (emf)

The force that causes electrons to move through a conductor.

### Electron Current

The current from a negative charge to a positive charge.

### Free Electrons

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

### High Voltage

A term that normally implies a voltage higher than 600 volts.

### Insulator

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

### Kilohm

1.000 ohms. Usually written 1k omega.

### Megohm

1.000.000 ohms. Written 1M omega or 1 meg omega.

### Megohmmeter

An insulation-resistance tester. Consisting of a high-range ohmmeter and a high-voltage generator.

### Ohm

The basic unit of resistance measure. One ohm is equal to the resistance that allows 1 ampere of current to flow when an emf of 1 volt is applied.

### Ohmmeter

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

### Omega

Greek letter for ohm.

### Open circuit

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

### Voltage

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

### Voltmeter

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

POTENTIAL

GENERATOR

VOLTMETER

### How should a voltmeter be connected in a circuit to measure voltage?

Across or in parallel with the potential points being measured.

### Without a given potential, how do free electrons in a conductor constantly move?

From negative to positive.

AMMETER

### An ammeter must be connected in the circuit in such a way that...

All current flows through it.

### Resistance

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...

OHM: Named after the German physicist and mathematician George Simon Ohm.

OHM

### Ohm's Law is used to determine relationships between...

VOLTAGE, CURRENT & RESISTANCE

### What two meters are used to measure electrical resistance?

MEGOHMMETER & OHMMETER

E = I x R

Power

Voltage

### (I) means?

Current, Amp or Amperage

### (R) means?

Ohms or Resistance

CURRENT FLOW

PRESSURE

### In an electrical system, the potential is provided by a storage _____, a mechanically driven _____, or a dry cell.

BATTERY; GENERATOR

VOLTMETER

ELECTRONS

### Materials that have few free electrons are called _____.

INSULATORS: Mica, porcelain, glass, bakelite and silicone are good insulating materials.

POSITIVE

VOLTAGE

Example: