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Ohm’s law states:A. Voltage = Current x ResistanceB. Amperes = Current × Resistance C. Voltage = Resistance ÷ Amperes D. Ohms = Voltage ÷ Current
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Voltage = Current x Resistance
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An electromagnetic-induction device usually has which of the following materials in its core?A. BrassB. SilverC. AluminumD. Iron
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Iron Iron is easily magnetized and demagnetized, so it works well for this device.
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How many diodes should you expect to find in a bridge rectifier? A. 0B. 4C. 8D. 10
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4 A bridge rectifier is also known as a full wave rectifier, usually containing 4 diodes.
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Another name for cycles per second is: A. WattsB. VoltageC. HertzD. Amperes
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Hertz The number of times alternating current changes direction in one second is known as its frequency, which is measured in hertz.
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Newer cell phones contain a removable memory card, which is often called a:A. SIM cardB. DIM cardC. PIN cardD. Pin chip
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SIM card SIM stands for Subscriber Identity Module. The card contains information such as your phone number, your billing information, and your address book. It makes it easier to switch from one cell phone to another.
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Two electrical wires run to a machine. One wire is 6mm thick, and the other is 3mm thick. For the two wires to carry the same current, the larger wire: A. Requires less voltageB. Requires more voltageC. Requires the same voltageD. It can’t be determined from the information given.
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Requires less voltage Larger wires require less electrical pressure to run current.
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Which of the following isn’t a component of a DC motor?A. Rotor barsB. ArmatureC. Field PolesD. Yoke
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Rotor bars are found only on AC induction motors.
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A current passed through a muscle in the human body causes the muscle to contract. This is known as: A. The chemical effect of currentB. The biological effect of currentC. The magnetic effect of currentD. The physiological effect of current
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The ability of current to contract muscles is called the physiological effect.
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In a closed electrical circuit:A. One terminal is always positive, and one terminal is always negative.B. Both terminals can be positive. C. Both terminals can be negative. D. Terminals are neither positive nor negative.
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In a closed circuit, one terminal is always positive, and the other is always negative.
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What does RMS stand for?A. Root mean squareB. Resistance Measurement SystemC. Real Metric Standards D. Realistic Matrix Stems
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Root mean square
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