Problem Set no. 3 a PDF

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Circuit 1 Problem Set...

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Problem Set # 3 Ohm’s Law, Voltage Divider Rule (VDR) and Current Divider Rule (CDR) PLANTERAS, Neans S. BSEE 2-A

October 15, 2020

A. Ohm’s Law 1. An alarm clock draws 0.5 A of current when connected to a 120 volts circuit. Calculate its resistance. Given: I = 0.5 A V = 120 volts

Required: R=?

Solution: V = IR

R=

V 120V = =240 ohms I 0.5 A

2. A subwoofer needs a household voltage of 110 V to push a current of 5.5 A through its coil. What is the resistance of the subwoofer? Given: I = 5.5 A V = 110 volts

Required: R=?

Solution: V = IR

R=

V 110 V = =20 ohms I 5.5 A

3. A walkman uses a standard 1.5 V battery. How much resistance is in the circuit if it uses a current of 0.01A? Given: I = 0.01 A V = 1.5 volts

Required: R=?

Solution: V = IR

R=

V 1.5V =150 ohms = I 0.01 A

4. A circuit contains a 1.5 – volt battery and a bulb with a resistance of 3 ohms. Calculate the current. Given: R = 3 ohms V = 1.5 volts

Required: I=?

Solution: V = IR

V 1.5 V I= = =0.5 ohms R 3Ω

5. What current flows through a hair dryer plugged into a 120 Volt circuit if it has a resistance of 25 ohms?

Given: R = 25 ohms V = 120 volts

Required: I=?

Solution: V = IR

V 120 V I= = =4.8 ohms R 25 Ω

6. If a toaster produces 12 ohms of resistance in a 120-volt circuit, what is the amount of current in the circuit? Given: R = 12 ohms V = 120 volts

Required: I=?

Solution: V = IR

V 120 V =10 ohms I= = R 12 Ω

7. 12 Volt car battery pushes charge through the headlight circuit resistance of 10 ohms. How much current is passing through the circuit? Given: R = 10 ohms V = 12 volts

Required: I=?

Solution: V = IR

V 12 V I= = =1.2 ohms R 10 Ω

8. How much voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms of resistance? Given: R = 5 ohms I = 10 amps

Required: V=?

Solution: V = IR

V = ( 10 A ) ( 5 Ω ) = 50 volts

9. An electric heater works by passing a current of 100 A though a coiled metal wire, making it red hot. If the resistance of the wire is 1.1 ohms, what voltage must be applied to it? Given: R = 1.1 ohms I = 100 A

Required: V=?

Solution: V = IR V = ( 100 A ) ( 1.1 Ω ) = 110 volts

10. A light bulb has a resistance of 5 ohms and a maximum current of 10 A. How much voltage can be applied before the bulb will break?

Given: R = 5 ohms I = 10 A

Required: V=?

Solution: V = IR V = ( 10 A ) ( 5 Ω ) = 50 volts...