1. A resistor has color bands brown, black, and red and a current of 25 mA. Determine th...

1. A resistor has color bands brown, black, and red and a current of 25 mA. Determine the voltage across it.

2. For a resistive circuit, what is I if E = 500 V and R is open circuited? Will the current change if the voltage is doubled?

3. A certain resistive circuit has voltage E and resistance R. If I = 2.5 A, what will be the current if:

a. E remains unchanged but R is doubled?

b. E remains unchanged but R is quadrupled?

c. E remains unchanged but R is reduced to 20% of its original value?

d. R is doubled and E is quadrupled?

4. The voltmeters of Figure 4–13 have autopolarity. Determine the reading of each meter, its magnitude and sign.