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39 Cards in this Set
- Front
- Back
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If five electrons combine with three protons, the net charge will be ?
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negative
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as loads are added in a parallel circuit, the total resistance of the circuit will?
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decrease
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If two light bulbs are wired in series and one bulb burns out, the other bulb will?
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go out
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What happens to the current in a circuit if the resistance is increased?
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the current decreases
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What type of charge does an electron have?
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negative
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What part of an atom moves from one atom to another?
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electron
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Typical insulators are?
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glass, rubber, plastic
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To find watts of electrical power in an electrical circuit, you multiply?
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volts and amps
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an ampere is ?
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a coulomb per second
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The compressor motor and condenser fan motor are wired in ?
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parallel
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An element in an electric heating unit is applied to a 232 volt power supply. The current flow through the element is 19 amps. what is the resistance of the element?
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12 ohms
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If a conductor carrying electrical current is formed into a coil, the magnetic field around the wire will?
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increase
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Electricity is the movement of ?
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free electrons from one atom to another
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The law of charges states ?
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unlike charges attract
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In a parallel circuit containing a 3 ohm, a 7 ohm, and a 10 ohm resistor, the current flow is highest through what resistor?
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3 ohm
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A defective coil could be caused by ?
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a short to ground
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In a parallel circuit, the total current will..?
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increase as additional resistors are added in parallel
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true or false: If three bulbs are wired in parallel and one bulb burns out, the total current of the circuit will decrease
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True
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true or false: as the diameter of a wire increases, its resistance will also increase
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false
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True or false: When calculating the total resistance of a parallel circuit, the result will always be lower than the lowest resistance
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True
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True or false: One kilowatt of electrical energy is equal to 1,000,000 watts
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false
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True or false: In a circuit with two or more resistances in series, the total resistance in the circuit is the sum of the resistances
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true
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True or false: In a circuit with two or more resistances in parallel, the total resistance in the circuit is the sum of th resistances in the circuit
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false
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True or false: ohmmeters are to be used only on circuits that are de-energized
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true
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A good conductor of electricity is said to have ........... electrons which can move easily from one atom to another
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free
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A 50 ohm load and a 100 ohm load are connected in series to a 120 volt supply. A voltmeter would read ........... volts if connected across the 50 ohm load, and ............ volts if connected across the 100 ohm load
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40 volts
80 volts |
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The unit of measure for resistance is the?
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ohms
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The unit of measure for the current flow of electrical energy is the ?
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amps
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The unit of measure for the electrical pressure forcing electrical energy through a conductor is the ?
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volts
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If there was a current flow of 6 amps in a 120-V circuit, the resistance of the circuit would be ....... ohms
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20
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A relay is a component made up of?
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contact and coil
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Three electric heating elements are connected in parallel with each other and each element draws 7 amps. The supply voltage is 210 volts.
a) What is the resistance of each heater? b) What would the current be through each of the two remaining heaters if one heater burns out? |
a) 30 ohms
b) 7 amps |
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What is the total current in a circuit that has two electric heating elements that have resistances of 5 ohms and 20 ohms? The elements are connected in parallel with each other and are connected to a 200-v power supply.
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50 amps
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If two 60-watt light bulbs are wired in parallel with each other and are connected to a 120-V power supply, what will a voltmeter read if connected across the first bulb? the second bulb?
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first bulb = 120 V
second bulb = 120 V |
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If two 60-watt light bulbs are wired in parallel with each other and are connected to 120-Volt power supply, what will a voltmeter read if connected across the first bulb? and the second bulb?
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first bulb = 60v
second bulb = 60v |
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If two electrical loads are connected in parallel with each other and each load draws six amps, what is the total current of the circuit?
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12 amps
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Why is rubber a good insulator?
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contains bound electrons
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How can the magnetic field around an iron core be increased?
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wrap copper coil around it
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What is meant by 60 hertz AC current?
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time for cycle
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