Resisitance In Electrical Systems Question Preview (ID: 1293)


Principles Of Technology I Unit 4: Resistance Subunit 3: Electrical Systems.

Electrical resistance is a volt...
a) divided by an amp.
b) multiplied by an amp.
c) divided by time.
d) multiplied by time.

The electrical resistance of a wire is determined by the
a) type, size, and length of the wire.
b) color of the wire.
c) melting point of the wire.
d) malleability of the wire.

What does turning the knob on a dimmer switch do?
a) It changes the amount of current going to the bulb which changes the brightness.
b) It changes the amount of voltage going to the bulb which changes the brightness.
c) It pinches the wire to prevent the flow of electrons.
d) It causes the wire to coil or uncoil which slows the flow of electrons.

Materials that have a high electrical resistance are called
a) resistors.
b) conductors.
c) semi-conductors.
d) ohms.

Electrical resistance is measured in ohms. What is the correct symbol for ohms?
a) О©
b) П‰
c) ПЂ
d) ПЃ

In what direction to electrons flow in a circuit?
a) from negative electrode to the positive electrode.
b) from positive electrode to the negative electrode.
c) back and forth
d) in any direction

The equations resistance equals voltage divided by current is known as ____ Law.
a) Ohm's
b) Newton's
c) Coulomb's
d) Einstein's

Resistivity of a wire
a) is the capacity of a wire to resist an electric current.
b) is the capacity of a wire to transmit an electric current.
c) is determined by the temperature of the wire.
d) is the same for any type of wire.

The unit to measure the resistivity of a wire is
a) О©.cm
b) О©/cm
c) ПЃ
d) ОјО©

In a series circuit, the total resistance equals the
a) sum of all the resistors.
b) product of all the resistors.
c) 1/2 the sum of each resistor.
d) the product of the resistors divided by the sum of the resistors

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