Electronic Principles Questions

• The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio?
• Most AC power is obtained from:
• The direction of electron current flow is:
• Which one of the following principles best describes the basic operation of an electromagnet?
• A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?
• Which one of the following devices is most often used for measuring electrical potential difference?
• Silicon atoms combine into an orderly pattern called a
• The rotating coil of wire in an electric motor is called the:
• Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?
• Which one of the following statements most accurately applies to the frequency of a waveform?
• What is the smallest number of polarities required for current flow?
• The value of a capacitor can be made larger by:
• Which one of the following equations most directly determines the power dissipation of a resistance when you know the voltage drop and amount of resistance?
• Suppose a voltage source has an ideal voltage of 12V and an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff?
• Which one of the following equations most directly determines the amount of current flowing through a resistor when you know the value of the resistor and the voltage drop across it?
• Voltage is
• The north pole of a magnet is the one:
• A resistor has a rated value of 100 ohm and a tolerance of 10%. What is its minimum and maximum allowable resistance value?
• What is the turns ratio for the transformer specified in the above question?
• What is a negative ion?