Electrical current multimeter

Procedure Fill a beaker two-thirds with salt solution, dip a copper strip to one side of the beaker and magnesium ribbon to the other side. Attach both metals to a multimeter, record the voltages. Check formation of an electric current with a light bulb or an electric motor. Replace magnesium by other metals like zinc or iron, or even with copper record the values measured. 

Tip In order to attain a spectacular voltage out of a lemon , two different metal strips could be placed inside the lemon and the voltages measured the juice of the acidic cell serves as an electrolyte solution in this case. If the voltage or the current is too weak to start the motor or the light bulb, the multimeter can be used to measure the electric current. 

MiUiammeter A test instrument for measuring electrical current, often part of a multimeter. Millihenry A quantity equal to one-thousandth of a henry. 

Some PEM fuel cell performance data were obtained using an electrical resistor to provide a variable load. Two digital multimeters and a shunt resistor were used to measure the voltage and current, so we could calculate the power produced. 

An electrical testing load system was prepared as shown below using two variable resistance potentiometers rated at 0 to 1.0 ohm at 25 watts, a current measuring shunt, and two digital multimeters. 

Electricity you will be surprised how handy it is to have a modern multimeter. Be careful not to overload the multimeter (especially in its resistance and current measuring modes). 

Engineers need to measure electron flow when they are designing and testing electrical devices. To perform this measurement operation, they use a tool called a digital multimeter (Figure 13-24). The most common measurements taken with the multimeter are voltage, resistance, and current flow. 

The voltage, current flow, and resistance of an electrical pathway can he measured using a multimeter. 

Rods and cylinders for the SPS die used in this study were SCPOl made by Japan Fine Ceramics Co., Ltd. (JFC) and ET-10 made by TaeguTec Ltd. Electrical conductivities of these materials were measured by the four-terminal method. The scheme of the measurement is shown in Eig. 1. Thermocouples with SUS sheath were inserted into the holes (2 mm in internal diameter, 3 mm in depth). Voltage drop was measured between two SUS sheaths. Temperature was measured using the center thermocouple with a digital multimeter (temperature mode with internal compensation of reference junction). Various voltages were applied to the SiC rod. When the temperature became constant at each applied voltage, the temperature, the voltage drop and the current were measured. Then electrical conductivities were calculated. 

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