Questions and Answers
An ammeter is used to measure the amount of voltage in a circuit that is powered.
False
For most electrical circuits, the voltage level may vary ±10% from the rated voltage.
True
Amperage measurements are normally taken to indicate the amount of circuit loading or the condition of the load.
True
Many meters include a fuse in the low-ampere range to prevent meter damage caused by excessive current.
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High voltage applied to a meter set to measure resistance causes meter damage.
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Megohmmeter test voltages range from 50v to 5000v.
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A receptacle tester is a test instrument that indicates the presence of voltage when the test tip touches, or is near, an energized circuit.
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To measure frequency, the scope probes are connected in parallel with the circuit or component under test.
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A ___ tachometer is a device that measures the speed of an object without contact with the object.
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A(n) ___ is a special DC voltmeter that detects the presence or absence of a signal.
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___ is the amount of electrical pressure in a circuit.
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___ is the measurement of the intensity of heat.
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Digital circuits fail because the ___ is lost somewhere between the circuit input and output stages.
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A(n) ___ is used to measure the amount of current flowing in a circuit that is powered.
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A(n) ___ ammeter is a meter that measures current in a circuit by inserting the meter in series with component(s) under test.
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A(n) ___ ammeter is a meter that measures current in a circuit by measuring the strength of the magnetic field around a conductor.
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A(n) ___ is a device that is used to measure the amount of resistance in a component (or circuit) that is not powered.
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A(n) ___ is a test instrument with a bulb that is connected to two test leads to give a visual indication when voltage is present in a circuit.
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___ ammeters are used to measure currents from 0.01A or less to 1000A or more.
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A(n) ___ is a device that detects insulation deterioration by measuring high resistance values under high test voltage conditions.
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A(n) ___ tachometer is a device that measures temperature at a single point.
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A(n) ___ is a device that detects heat patterns in the infrared-wavelength spectrum without making direct contact with equipment.
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A(n) ___ tachometer is a device that uses flashing light to measure the speed of a moving object.
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A(n) ___ is a device that gives a visual display of voltages.
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A(n) ___ is a reference point/line that is visually displayed on the face of the scope screen.
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A(n) ___ is an instrument that displays an instantaneous voltage.
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___ is the movement of the displayed trace across the scope screen.
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Study Notes
Ammeter and Voltage Measurement
- An ammeter measures the current flowing in a powered circuit, not voltage.
- Amperage readings indicate circuit loading and the condition of the load.
- Many meters are equipped with a fuse in the low-amp range to safeguard against excessive current.
Voltage and Resistance
- Voltage in electrical circuits can vary ±10% from its rated level.
- High voltage applied to a resistance meter can cause damage.
- Megohmmeters test insulation resistance with voltages ranging from 50V to 5000V.
Testing Instruments
- A receptacle tester detects voltage presence but does not measure voltage levels.
- Frequency measurement requires scope probes connected in parallel with the circuit or component.
Specialized Measurement Devices
- Tachometers measure object speed; photo tachometers do so without direct contact.
- A digital logic probe detects signal presence or absence in circuits.
- Ohmmeters measure resistance in non-powered circuits, while test lights visually indicate voltage presence.
Types of Ammeters
- Inline ammeters measure current by being placed in series with circuit components.
- Clamp-on ammeters measure current by detecting magnetic fields around conductors.
- Clamp-on ammeters are capable of measuring currents from 0.01A to over 1000A.
Other Measurement Devices
- Megohmmeters identify insulation deterioration by measuring high resistance under high voltage.
- Contact tachometers measure temperature at a specific point.
- Thermal imaging devices detect heat patterns without direct contact.
Oscilloscope Functionality
- Oscilloscopes visually display voltages, with the trace serving as a reference point on the screen.
- The 'sweep' refers to the movement of the displayed trace across the oscilloscope’s screen.
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Description
Test your knowledge on standard measurements in electronics with these flashcards from Chapter 9. Learn the differences between voltage and amperage, and understand how to measure circuit conditions effectively. Perfect for students looking to reinforce their understanding of electrical concepts.
