Dc Theory Level 2 Lesson 8 (2024)

FAQs

When using a test instrument with test leads, in what order should the leads be connected? ›

Connecting Test Leads: First, insert the black test lead into the COM jack. Then, insert the red lead into the VΩ jack. Always remove the leads in reverse order after testing: red first, then black. Testing the Circuit: With the circuit de-energized, connect the test leads across the component being tested.

The royal cubit (524 mm or 20.62 inches) was subdivided in an extraordinarily complicated way. The basic subunit was the digit, doubtlessly a finger's breadth, of which there were 28 in the royal cubit. Four digits equaled a palm, five a hand. Twelve digits, or three palms, equaled a small span.

An early definition of the metre was one ten-millionth of the Earth quadrant, the distance from the North Pole to the Equator, measured along a meridian through Paris. With the French Revolution (1789) came a desire to replace many features of the Ancien Régime, including the traditional units of measure.

One method of assessing the on-going accuracy of test instruments is to maintain records, over time, of measurements taken from designated circuits of reference. Before such a system is implemented, the accuracy of each test instrument must be confirmed; this could only be carried out by a formal calibration house.

Once the multimeter is set, you can test the live wire using the following methods: Method 1: Connect the red probe with the live wire and the black probe with the neutral wire and take the reading. Method 2: Connect the red probe with the live wire and the black probe with the earth wire and take the reading.

There were several cubits, once upon a time, with several different lengths. One of the most common was 18 inches (1.5 ft). So 9 of these cubits would be 9(1.5 ft) = 13.5 ft.

It may have originated in Egypt about 3000 bc; it thereafter became ubiquitous in the ancient world. The cubit, generally taken as equal to 18 inches (457 mm), was based on the length of the arm from the elbow to the tip of the middle finger and was considered the equivalent of 6 palms or 2 spans.

50 cubits is about 74 feet. You can do any conversion this way.

3. Two circles of latitude never touch because they are parallel to each other and are always equidistant from the equator. Any two circles of latitude will always be separated by a fixed distance, which is equal to the difference in their latitudes. 4.

The prime meridian, which runs through Greenwich, England, has a longitude of 0 degrees. It divides the Earth into the eastern and western hemispheres.

Where do all meridians meet? ›

All meridians meet at the North and South Poles. Longitude is related to latitude, the measurement of distance north or south of the Equator. Lines of latitude are called parallels. Maps are often marked with parallels and meridians, creating a grid.

The accuracy of instrumentation is determined by the difference of a measured value compared to its actual (true) value. As no measurement is 100% exact an element of inaccuracy needs to be considered, hence the reason why accuracy figures are quoted with '±'.

Analog signals are more prone to noise interference since they are continuous and can be affected by external factors such as electromagnetic interference. On the other hand, digital signals, are less susceptible to noise since they are discrete and can be easily filtered and processed.

Calibration is important because it helps ensure accurate measurements, and accurate measurements are foundational to the quality, safety and innovation of most products and services we use and rely on every day. Few people realize the critical role and importance of calibration in their daily lives.

Connect tester leads to the battery, clamping the red clamp to the vehicle positive battery terminal first. Then, clamp the black clamp to the vehicle negative battery terminal second. Note: Whenever possible, connect directly to the terminals/ posts of the battery.

How should meter test leads be connected for testing a circuit? make sure the circuit is de-energized, connect the neutral test lead first then the hot test lead.