Ohms Law


Posted on Feb 7, 2014

Restricting the resistance values between 1 k © and 100 k © for the sake of obtaining accurate voltage and current readings with your meter. With very low resistance values, the internal resistance of the ammeter has a significant impact on measurement accuracy. Very high resistance values can cause problems for voltage measurement,the internal resistance of the voltmeter substantially changing circuit resistance


Ohms Law
Click here to download the full size of the above Circuit.

when it is connected in parallel with a high-value resistor. At the recommended resistance values, there will still be a small amount of measurement error due to the "impact" of the meter, but not enough to cause serious disagreement with calculated values. Select a resistor from the assortment, and measure its resistance with your multimeter set to the appropriate resistance range. Be sure not to hold the resistor terminals when measuring resistance, or else your hand-to-hand body resistance will influence the measurement! Record this resistance value for future use. Build a one-battery, one-resistor circuit. A terminal strip is shown in the illustration, but any form of circuit construction is okay. Set your multimeter to the appropriate voltage range and measure voltage across the resistor as it is being powered by the battery. Record this voltage value along with the resistance value previously measured. Set your multimeter to the highest current range available. Break the circuit and connect the ammeter within that break, so it becomes a part of the circuit, in series with the battery and resistor. Select the best current range: whichever one gives the strongest meter indication without over-ranging the meter. If your multimeter is autoranging, of course, you need not bother with setting ranges. Record this current value along with the resistance and voltage values previously recorded. Taking the measured figures for...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    R/C Thermal Peak Detection NiCd Charger
    Controlling stepper motors
    Air Ioniser circuit
    Isolation and zero voltage switching logic
    Temperature sensor and DVM interface
    Vocal Eliminator
    3-Way Light Control
    Design and making of the stabilized voltage supply of switch
    555 pulse timer circuit diagram basic
    I have a Teac ctm805sr tv suffering pincushion
    CF8865 module using dedicated switching power supply circuit diagram



    Top