3. In a circuit, a variable resistor is to be connected across a potential difference of 60 V to allow the current to be adjusted in the range from 40 mA to 100 mA. Over what range must the resistance vary?

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Current, Resistance, and Circuits PLS ANSWER NO.3
1. Three resistors are connected in series to a 24-V battery, and an ammeter in
the circuit reads 0.50 A. The first resistor is rated at 22 ohms, and the second at
8 ohms. Find the
(a) total resistance;
(b) resistance of the third resistor; and
(c) potential difference across the third resistor.
2. We would like to make a 600-ohm resistor out of Nichrome wire with a cross-
sectional area of 3.0 x 103 square centimeter. If the resistivity of Nichrome is
110 x 106 ohm-centimeters, how long should the wire be?
3. In a circuit, a variable resistor is to be connected across a potential difference
of 60 V to allow the current to be adjusted in the range from 40 mA to 100 mA.
Over what range must the resistance vary?
4. Three 60.0-W, 120-V lightbulbs are connected across a 120-V power source.
Find (a) the total power delivered to the three bulbs and (b) the potential
difference across each.
R1
120 V
R2
R3
Assume the resistance of each bulb is constant.
5. In the figure below, with an emf equal to
How much energy is dissipated by all four resistors in 1 min?
2.0 V, R, = 6.0N and R2 = 18.0 N.
R1
R2
R2
R2
Transcribed Image Text:1. Three resistors are connected in series to a 24-V battery, and an ammeter in the circuit reads 0.50 A. The first resistor is rated at 22 ohms, and the second at 8 ohms. Find the (a) total resistance; (b) resistance of the third resistor; and (c) potential difference across the third resistor. 2. We would like to make a 600-ohm resistor out of Nichrome wire with a cross- sectional area of 3.0 x 103 square centimeter. If the resistivity of Nichrome is 110 x 106 ohm-centimeters, how long should the wire be? 3. In a circuit, a variable resistor is to be connected across a potential difference of 60 V to allow the current to be adjusted in the range from 40 mA to 100 mA. Over what range must the resistance vary? 4. Three 60.0-W, 120-V lightbulbs are connected across a 120-V power source. Find (a) the total power delivered to the three bulbs and (b) the potential difference across each. R1 120 V R2 R3 Assume the resistance of each bulb is constant. 5. In the figure below, with an emf equal to How much energy is dissipated by all four resistors in 1 min? 2.0 V, R, = 6.0N and R2 = 18.0 N. R1 R2 R2 R2
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