The core of a transformer is usually laminated in order to
reduce magnetic leakage
reduce eddy current
prevent vibration of the transformer
make magnetic reversal in the core much easier
Correct answer is B
No explanation has been provided for this answer.
The magnetic relay is a device used for
timing in sports
storing magnetic field
reading the magnitude of magnetic flux
controlling another circuit carrying larger current
Correct answer is D
No explanation has been provided for this answer.
A 12\(\Omega\) resistor dissipates 8kJ of heat in 20s. Calculate the current through the resistor
5.8A
6.9A
30.0A
33.3A
Correct answer is A
Q = I2Rt
I = \(\sqrt{\frac{Q}{Rt}}\)
= \(\sqrt{\frac{8000}{12 \times 20}}\)
= 5.8
P
Q
R
S
Correct answer is B
The determinant of the brightness of a bulb is the power (watts) of the circuit.
Recall that Power (P) = \(\frac{V^2}{R}\).
Since the resistance is to be used as a divisor, it means the smaller the resistance, the greater the power.
Bank deposit
Joint demand
Scale of preference
Double coincidence of wants
Correct answer is D
Double coincidence of wants is when two people have goods they are both happy to swap in exchange.
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