IMD 4051 - Electricity & Controls

• Describe the structure of an atom.

• Identify atoms with a positive charge and atoms with a negative charge.

• Explain the characteristics that make certain materials good conductors and others good insulators.

• Describe how magnetism is used to produce electricity.

• State the differences between alternating current and direct current.

• List the units of measurement for electricity.

• Explain the differences between series and parallel circuits.

• State Ohm’s law.

• State the formula for determining electrical power.

• Describe a solenoid.

• Explain inductance.

• Describe the construction of a transformer and the way a current is induced in a secondary circuit.

• Describe how a capacitor works.

• Describe a sine wave.

• State the reasons for using proper wire sizes.

• Describe the physical characteristics and the function of several semiconductors.

• Describe procedures for making electrical measurements.

• Describe the function of a bimetal device.

• Make general comparisons between different bimetal applications.

• Describe the rod and tube.

• Describe fluid-filled controls.

• Describe partial liquid/partial vapor-filled controls.

• Distinguish among the bellows, diaphragm, and Bourdon tube.

• Discuss the thermocouple.

• Explain the thermistor.

• Discuss space temperature control.

• Describe the mercury control bulb.

• Describe system overshoot and temperature swing.

• Describe the difference between low- and high-voltage controls.

• Identify some commonly used low- and high-voltage controls.

• Name two ways motors are protected from high temperature.

• Describe the difference between a diaphragm and a bellows control.

• State the uses of pressure-sensitive controls.

• Describe a high-pressure control.

• Describe a low-pressure control.

• Discuss the range and differential of a control.

• Describe pressure transducers.

• Describe a pressure relief valve.

• Describe the functions of mechanical and electromechanical controls

• Describe and identify power- and non-power-consuming devices.

• Describe how a voltmeter is used to troubleshoot electrical circuits.

• Identify some typical problems in an electrical circuit.

• Describe how an ammeter is used to troubleshoot an electrical circuit.

• Describe how a voltmeter is used to troubleshoot an electrical circuit.

• Recognize the components in a heat-cool electrical circuit.

• Follow the sequence of electrical events in a heat-cool electrical circuit.

• Differentiate between a pictorial and a line-type electrical wiring diagram.