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Resisitance In Electrical Systems
Test Description: Principles of Technology I Unit 4: Resistance Subunit 3: Electrical Systems
Instructions: Answer all questions to get your test result.
1) Electrical resistance is a volt...
A
multiplied by time.
B
multiplied by an amp.
C
divided by an amp.
D
divided by time.
2) The electrical resistance of a wire is determined by the
A
malleability of the wire.
B
melting point of the wire.
C
type, size, and length of the wire.
D
color of the wire.
3) What does turning the knob on a dimmer switch do?
A
It pinches the wire to prevent the flow of electrons.
B
It causes the wire to coil or uncoil which slows the flow of electrons.
C
It changes the amount of voltage going to the bulb which changes the brightness.
D
It changes the amount of current going to the bulb which changes the brightness.
4) Materials that have a high electrical resistance are called
A
semi-conductors.
B
conductors.
C
resistors.
D
ohms.
5) Electrical resistance is measured in ohms. What is the correct symbol for ohms?
A
О©
B
ПЃ
C
ПЂ
D
П‰
6) In what direction to electrons flow in a circuit?
A
from negative electrode to the positive electrode.
B
in any direction
C
from positive electrode to the negative electrode.
D
back and forth
7) The equations resistance equals voltage divided by current is known as ____ Law.
A
Einstein's
B
Coulomb's
C
Newton's
D
Ohm's
8) Resistivity of a wire
A
is the capacity of a wire to transmit an electric current.
B
is determined by the temperature of the wire.
C
is the capacity of a wire to resist an electric current.
D
is the same for any type of wire.
9) The unit to measure the resistivity of a wire is
A
ОјО©
B
О©/cm
C
О©.cm
D
ПЃ
10) In a series circuit, the total resistance equals the
A
the product of the resistors divided by the sum of the resistors
B
1/2 the sum of each resistor.
C
product of all the resistors.
D
sum of all the resistors.
*select an answer for all questions
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