# Practice Test: Question Set - 03

**1. A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange and silver?**

- (A) 2 mA

- (B) 2.2 mA

- (C) 214 mA

- (D) 21.4 mA

**2. How much resistance is required to limit the current from a 12 V battery to 3.6 mA?**

- (A) 3.3 kÎ©

- (B) 33
kÎ©

- (C) 2.2 kÎ©

- (D) 22 kÎ©

**3. What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?**

- (A) 9.7 Î©

- (B) 97 Î©

- (C) 23 Î©

- (D) 230 Î©

**4. You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?**

- (A) 9 V

- (B) 900 mV

- (C) 0 V

- (D) 18 V

**5. The current through a flashlight bulb is 40 mA and the total battery voltage is 4.5 V. The resistance of the bulb is approximately**

- (A) 112 Î©

- (B) 11.2 Î©

- (C) 1.2 Î©

- (D) 18 Î©

**6. A current of 200 ÂµA through a 6.8 kÎ© resistor produces a voltage drop of**

- (A) 34.4 V

- (B) 340 V

- (C) 13.6 V

- (D) 1.36 V

**7. According to Ohm’s Law**

- (A) V is
directly proportional to I

- (B) V is
inversely proportional to I

- (C) V is
directly proportional to √I

- (D) All o the
above

**8. Four amperes of current are measured through a 24 Î© resistor connected across a voltage source. How much voltage does the source produce?**

- (A) 960
V

- (B) 9.6 V

- (C) 96 V

- (D) 8 V

**9. Approximately how much current flows through a 3.3 MÎ© resistor across a 30 V source?**

- (A) 9 Î¼A

- (B) 90 Î¼A

- (C) 900 Î¼A

- (D) 9000 Î¼A

**10. What is the approximate filament resistance of a light bulb if it operates from a 110 V source and 0.6 A of current is flowing?**

- (A) 183 Î©

- (B) 18.3 Î©

- (C) 66 Î©

- (D) 6.6 Î©

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