Q.1
A half-watt is equal to how many milliwatts?
Q.2
In 40 kW, there are
Q.3
The watt is the unit of power.
Q.4
A resistor normally opens when it burns out.
Q.5
The power rating of a resistor determines the minimum power that it can handle safely.
Q.6
A 6 V battery is connected to a 300 Ω load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load?
Q.7
The capacity of a battery is measured in milli-amperes.
Q.8
The joule is a unit of energy.
Q.9
Energy is equal to power multiplied by voltage.
Q.10
A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is
Q.11
Watt's law states the relationships of power to energy.
Q.12
A 3.3 kΩ resistor dissipates 0.25 W. The current is
Q.13
A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is
Q.14
Power rating is related to resistance value.
Q.15
In 0.025 W, there are
Q.16
Three hundred joules of energy are consumed in 15 s. The power is
Q.17
A 15 V source is connected across a 12 Ω resistor. How much energy is used in three minutes?
Q.18
If it takes 400 ms to use 12,000 J of energy, the power is
Q.19
A 120 Ω resistor must carry a maximum current of 25 mA. Its rating should be at least
Q.20
How much continuous current can be drawn from a 60 Ah battery for 14 h?
Q.21
At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?
Q.22
When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is
Q.23
The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be
Q.24
A 68 Ω resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is
Q.25
A 33 Ω half-watt resistor and a 330 Ω half-watt resistor are connected across a 12 V source. Which one(s) will overheat?
Q.26
A 75 Ω load uses 2 W of power. The output voltage of the power supply is approximately
Q.27
A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt-hours of energy does it consume?
Q.28
A battery is one type of power supply that converts chemical energy into electrical energy.
Q.29
When the current through a 12 kΩ resistor is 8 mA, the power is
Q.30

Watt's law states the relationships of power to energy.

  • True
  • False
0 h : 0 m : 1 s