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What precautions should be observed when using an ammeter?
AMMETER SAFETY PRECAUTIONS Always start with the highest range of an ammeter. Turn OFF and discharge the circuit completely before you connect or disconnect the ammeter. In dc ammeters, observe the proper circuit polarity to prevent the meter from being damaged. Never use a dc ammeter to measure ac.
How do you use an ammeter step by step?
Below is a simple guide on how to use an ammeter.
- Step 1 – Determine what Type of Ammeter to Use. There are 2 different types of ammeters: analog and digital.
- Step 2 – Safety Preparations.
- Step 3 – Break the Circuit.
- Step 4 – Connect the Leads.
- Step 5 – Determine the Ammeter Reading.
What precaution must be taken when measuring resistance?
OHMMETER Safety PRECautionS Do not apply power to a circuit while measuring resistance. When you are finished using an ohmmeter, switch it to the ofF position if one is provided and remove the leads from the meter.
Which is a safety precaution or practice when working with electricity?
Always use appropriate insulated rubber gloves and goggles while working on any branch circuit or any other electrical circuit. 7. Never try repairing energized equipment. Always check that it is de-energized first by using a tester.
What precaution must be taken before removing an ammeter from a current transformer?
Hence, before removing ammeter from the circuit, the secondary winding of the current transformer must always be short-circuited by a wire of very low resistance.
What are the precautions taken while using a DC voltmeter and DC ammeter?
Always start with the highest range of a voltmeter. Deenergize and discharge the circuit completely before connecting or disconnecting the voltmeter. In dc voltmeters, observe the proper circuit polarity to prevent damage to the meter. Never use a dc voltmeter to measure ac voltage.
What is the use of ammeter?
ammeter, instrument for measuring either direct or alternating electric current, in amperes. An ammeter can measure a wide range of current values because at high values only a small portion of the current is directed through the meter mechanism; a shunt in parallel with the meter carries the major portion.
How does the ammeter work?
Ammeters work to measure electrical current by measuring the current through a set of coils with a very low resistance and inductive reactance. If the ammeter were connected in parallel, the path may become short-circuited such that all the current will flow through the ammeter instead of the circuit.
What is a safety precaution?
safety precaution in British English (ˈseɪftɪ prɪˈkɔːʃən) noun. a precaution that is taken in order to ensure that something is safe and not dangerous.
How do we safely use electricity?
Basic Safety Rules
- Avoid frayed or damaged cords. If electricity is flowing through a wire and the plastic or rubber covering of the wire is damaged, touching it might electrocute you.
- Don’t mix electricity and water. Water conducts electricity really well.
- Be extra careful around high-voltage devices.
What should precautions be taken when using an ohmmeter?
What precautions should be taken when using an ohmmeter? A particular circuit or component has a complete path for current to follow What does the term continuity mean? No resistance, overload to circuit (no measurable resistance) What is a short circuit? An incomplete circuit (infinite resistance)
How to use an ammeter to test a circuit?
1 Most ammeters use color coding to indicate positive and negative ends of a circuit. 2 The most commonly used ammeters have clamps that allow them to easily attach to wires. 3 You can also simply hold the leads of your ammeter to the bare wires of the broken circuit. 4 Be sure to only test one wire at a time.
How does the negative end of an ammeter work?
Essentially, the negative ( – ) end of your ammeter will connect to the power source side of the broken circuit. The positive end (+) will connect to the opposite side, so that the ammeter bridges the break. Most ammeters use color coding to indicate positive and negative ends of a circuit.
What are the safety precautions for digital multimeters?
1 General precautions. • When not in use, keep the digital multimeter knob in OFF position or the highest voltage position. 2 Continuity Check. • Before starting any measurement activity, you should check the multimeter for continuity. 3 Voltage Measurement. 4 Current Measurement. 5 Resistance Measurement.