Four resistors are connected in a circuit with a battery of unknown emf, as shown below. The battery is ideal, so it has no internal resistance. The current in the 30 N resistor is 100. milliamps. Note that you should be able to do this problem without a calculator. 20 Ω 60 Ω 30Ω 80 Ω (a) Calculate the current in the 60 N resistor. 50 (b) Calculate the current in the 80 N resistor. 150 mA (c) Calculate the power dissipated in the 20 N resistor. 0.45 (d) Calculate the current in the battery. 300 X mA

University Physics Volume 2
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Chapter10: Direct-current Circuits
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Four resistors are connected in a circuit with a battery of unknown emf, as shown below. The battery is ideal, so it has no internal resistance. The current in the 30 2 resistor is 100. milliamps. Note
that you should be able to do this problem without a calculator.
20 2
60 Ω
30 2
80 2
(a) Calculate the current in the 60 N resistor.
50
V mA
(b) Calculate the current in the 80 N resistor.
150
V mA
(c) Calculate the power dissipated in the 20 N resistor.
0.45
(d) Calculate the current in the battery.
300
X mA
Transcribed Image Text:Four resistors are connected in a circuit with a battery of unknown emf, as shown below. The battery is ideal, so it has no internal resistance. The current in the 30 2 resistor is 100. milliamps. Note that you should be able to do this problem without a calculator. 20 2 60 Ω 30 2 80 2 (a) Calculate the current in the 60 N resistor. 50 V mA (b) Calculate the current in the 80 N resistor. 150 V mA (c) Calculate the power dissipated in the 20 N resistor. 0.45 (d) Calculate the current in the battery. 300 X mA
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