13. What important safety precaution must be observed when measuring resistance

Question

13. What important safety precaution must be observed when measuring resistance in an electronic circuit? A. All power to the component under test must be disconnected B. The red test lead must be at the most positive point in the circuit. C. The meter's highest resistance range setting should be used until the actual value is determined. D. The black test lead must be connected to the chassis ground. Use this illustration to answer the question below. 14. Again, assume that each of the resistors in the circuit shown in the figure above has a resistance value of 100 k2. With switch S, open as shown, you measure the voltage across each resistor with your meter Which of the following statements is correct? A. Resistor R, will dissipate the most power B. Resistors R, R2, and R3 will dissipate equal amounts of power C. Resistor R will dissipate the most power D. Resistors R4 and R, will dissipate equal amounts of power 15. Of the following common metals, which has the highest conductivity rating? A. Silver B. Copper C. Gold D. Aluminum

Explanation / Answer

13) the meter's highest resistance range setting should be used until the actual value is determined.

14) resistors R1,R2,R3 will dissipate equal amount of power.

16) the meter would read 2volts across R1 and 2volts across R2.

17) connect the multimeter between the points C and D and measure the resistance with switch open.

18) P=6*0.04=0.24 watts.

20) V=1.2+1.2+3.6=6 VOLTS.

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