Intro to Electrical Circuits

26103-23

Conductors

____________ are elements such as copper and silver that will conduct a flow of electricity very readily

Insulators

______________ do not conduct electricity to any great degree and are used when it is desirable to prevent the flow of electricity.

Semiconductors

Materials such as germanium and silicon are not good conductors but cannot be used as insulators either, These in-between materials are classified as ____________________.

Transformers

Devices known as ________________ used to step the voltage down to lower levels as it reaches electrical substations and eventually homes offices, and factories.

Voltage

The force that causes electrons to move is called ________, potential difference, or electromotive force (emf).

Current

The _______ in a circuit is equal to the voltage applied to the circuit divided by the resistance the circuit.

Resistance

The __________ of a circuit is equal to the voltage applied to the circuit divided by the current in the circuit.

Voltage

The applied _______ to a circuit is equal to the product of the current and the resistance of the circuit.

Sum

In a series circuit, the total resistance the circuit is equal to the ___ of the individual resistances.

(1) Voltage (2) Current

In a parallel circuit, the (1)_______ drop is the same through all loads but (2)________ is divided between the loads.

Individual

The total current drawn in a parallel circuit is the sum of the ______________ branch currents.

Smallest

In a parallel circuit, the total resistance is less than the _________ of the individual resistances.

Parallel

In ______________ circuits, there are three formulas that can be used to find total resistance. One is used when there are only two resistors, one when there is three or more, and one when multiple resistors have the same value.

Series

In-line ammeters must be connected in __________ to the circuit.

Continuity

Ohmmeters are used to measure resistance in loads but can also be used to check _________________.

Voltage testers

_______ _______ can be used as a troubleshooting tool and as a safety device to make sure the voltage is turned off before touching any terminals or conductors.

Power Equation (or Watt's Law)

The ____________ states that the number of watts used is equal to the number amperes of current times the potential difference or P=IxE.

Tolerance

The last color band on a resistor represents its ______________. It is either Gold (5%) or Silver (10%).

Negative

Electrons have a positive or negative charge?

Positive

Protons have a positive or negative charge?