New Zealand NZART pool, section ZLB04

Subelement ZLB

Basic Electrical Theory

Section ZLB04

Measurement Units

ZLB0401

The unit of impedance is the

A.
ampere
B.
farad
C.
henry
Correct Answer
D.
ohm

ZLB0401

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ZLB0402

One kilohm is

A.
10 ohm
B.
0.01 ohm
C.
0.001 ohm
Correct Answer
D.
1000 ohm

ZLB0402

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ZLB0403

One kilovolt is equal to

A.
10 volt
B.
100 volt
Correct Answer
C.
1000 volt
D.
10,000 volt

ZLB0403

Just like a kilometer equates to 1000 meters, a kilovolt would equate to 1000 volts.

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ZLB0404

One quarter of one ampere may be written as

A.
250 microampere
B.
0.5 ampere
C.
0.25 milliampere
Correct Answer
D.
250 milliampere

ZLB0404

Correct answer: 250 milliampere

One quarter of one ampere is:

\[ \frac{1}{4} \times 1\ \mathrm{A} = 0.25\ \mathrm{A} \]

Convert to milliamps:

\[ 0.25\ \mathrm{A} = 250\ \mathrm{mA} \]

250 microampere = 0.00025 A (too small)
0.5 ampere = half an ampere
0.25 milliampere = 0.00025 A (too small)

Therefore, one quarter of one ampere is 250 milliampere.

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ZLB0405

The watt is the unit of

Correct Answer
A.
power
B.
magnetic flux
C.
electromagnetic field strength
D.
breakdown voltage

ZLB0405

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ZLB0406

The voltage 'two volt' is also

Correct Answer
A.
2000 mV
B.
2000 kV
C.
2000 uV
D.
2000 MV

ZLB0406

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ZLB0407

The unit for potential difference between two points in a circuit is the

A.
ampere
Correct Answer
B.
volt
C.
ohm
D.
coulomb

ZLB0407

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ZLB0408

Impedance is a combination of

A.
reactance with reluctance
B.
resistance with conductance
Correct Answer
C.
resistance with reactance
D.
reactance with radiation

ZLB0408

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ZLB0409

One mA is

A.
one millionth of one ampere
Correct Answer
B.
one thousandth of one ampere
C.
one tenth of one ampere
D.
one millionth of admittance

ZLB0409

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ZLB0410

The unit of resistance is the

A.
farad
B.
watt
Correct Answer
C.
ohm
D.
resistor

ZLB0410

Correct answer: ohm

The unit of electrical resistance is the ohm (\(\Omega\)).

It is defined by Ohm’s Law:

\[ R = \frac{V}{I} \]

where:

\(R\) is resistance in ohms
\(V\) is voltage in volts
\(I\) is current in amperes
The farad is the unit of capacitance.
The watt is the unit of power.
A resistor is a component, not a unit.

Therefore, the unit of resistance is the ohm.

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