Ohms Law MCQs with Explanations

Ohm's Law helps us understand the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. The formula is: V = I x R We can rearrange this formula to find the current (I): I = V / R In this question, we are given: Voltage (V) = 18 kV = 18,000 V (Remember to convert kilovolts to volts!) Resistance (R) = 15 kΩ = 15,000 Ω (Convert kiloohms to ohms!) Now, let's plug these values into the formula: I = 18,000 V / 15,000 Ω I = 1.2 A Therefore, the current produced is 1.2 Amperes. The correct answer is A.

This question is about Ohm's Law , which is a fundamental rule in electrical circuits. Ohm's Law tells us how Voltage (V) , Current (I) , and Resistance (R) are related. The formula for Ohm's Law is: V = I * R Where: * V is the Voltage (measured in Volts) * I is the Current (measured in Amperes or Amps) * R is the Resistance (measured in Ohms) In our question, we know: * The Voltage (V) is 110 V * The Current (I) is 0.6 A We need to find the Resistance (R). To find R, we can rearrange the formula: R = V / I Now, let's plug in the values: R = 110 V / 0.6 A R ≈ 183.33 Ω So, the closest answer from the options is 183 Ω . That means Option A is correct.

Okay, let's break down this problem step-by-step! First, we need to figure out the resistance using the color code: red, orange, and silver. * Red = 2 * Orange = 3 * Silver = 10% tolerance (we'll ignore tolerance for calculating resistance). So, the resistor value is 23 ohms. Now, we can use Ohm's Law which is: Voltage (V) = Current (I) * Resistance (R) or V = IR. We know the voltage (V) is 50 V and the resistance (R) is 23 ohms. We want to find the current (I). We can rearrange Ohm's Law to solve for current: I = V / R Plug in the values: I = 50 V / 23 ohms = 2.17 Amperes(A). Since the options are in milliamperes (mA), we need to convert Amperes to milliamperes. Remember 1 A = 1000 mA. So, 2.17 A * 1000 mA/A = 217 mA (approximately). Option C: 217 mA

96 V is the correct answer to “Four amperes of current are measured through a 24 Ω resistor connected across a voltage source. How much voltage does the source produce”. This question is standard in competitive examination syllabi for Ohms Law.

False is the correct answer to “The ampere is the unit of resistance.”. This question is standard in competitive examination syllabi for Ohms Law.

32 V is the correct answer to “If you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be”. This question is standard in competitive examination syllabi for Ohms Law.

5.9 mA is the correct answer to “Approximately how many milli-amperes of current flow through a circuit with a 40 V source and 6.8 kΩ of resistance”. This question is standard in competitive examination syllabi for Ohms Law.

8.25 V is the correct answer to “If 750 µA is flowing through 11 kΩ of resistance, what is the voltage drop across the resistor”. This question is standard in competitive examination syllabi for Ohms Law.

V is directly proportional to I is the correct answer to “According to Ohm's Law”. This question is standard in competitive examination syllabi for Ohms Law.

9 µA is the correct answer to “Approximately how much current flows through a 3.3 MO resistor across a 30 V source”. This question is standard in competitive examination syllabi for Ohms Law.

82 Ω is the correct answer to “What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA”. This question is standard in competitive examination syllabi for Ohms Law.

151 µA is the correct answer to “A resistance of 3.3 MO is connected across a 500 V source. The resulting current is approximately”. This question is standard in competitive examination syllabi for Ohms Law.

31 Ω is the correct answer to “An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately”. This question is standard in competitive examination syllabi for Ohms Law.

1.36 V is the correct answer to “A current of 200 µA through a 6.8 kΩ resistor produces a voltage drop of”. This question is standard in competitive examination syllabi for Ohms Law.

500 V is the correct answer to “How much voltage is needed to produce 2.5 A of current through a 200 Ω resistor”. This question is standard in competitive examination syllabi for Ohms Law.

4 kΩ is the correct answer to “Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor”. This question is standard in competitive examination syllabi for Ohms Law.

680 Ω is the correct answer to “How much resistance is needed to draw 17.6 mA from a 12 volt source”. This question is standard in competitive examination syllabi for Ohms Law.

False is the correct answer to “The formula for finding resistance when current and voltage are known is $${\text{R}} = \frac{{\text{I}}}{{\text{V}}}.$$”. This question is standard in competitive examination syllabi for Ohms Law.

False is the correct answer to “The formula for finding voltage when resistance and current are known is $${\text{V}} = \frac{{\text{I}}}{{\text{R}}}.$$”. This question is standard in competitive examination syllabi for Ohms Law.

14.4 V is the correct answer to “When there is 12 mA of current through a 1.2 kΩ resistor, the voltage across the resistor is”. This question is standard in competitive examination syllabi for Ohms Law.

20 Ω is the correct answer to “A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.”. This question is standard in competitive examination syllabi for Ohms Law.

176 mA is the correct answer to “When 12 V are applied across a 68 Ω resistor, the current is”. This question is standard in competitive examination syllabi for Ohms Law.

2.2 kΩ is the correct answer to “If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is”. This question is standard in competitive examination syllabi for Ohms Law.

True is the correct answer to “Ohm's law describes how current is related to voltage and resistance.”. This question is standard in competitive examination syllabi for Ohms Law.

9 V is the correct answer to “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”. This question is standard in competitive examination syllabi for Ohms Law.

72 V is the correct answer to “What is the voltage source for a circuit carrying 2 A of current through a 36 Ω resistor”. This question is standard in competitive examination syllabi for Ohms Law.

112 Ω is the correct answer to “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”. This question is standard in competitive examination syllabi for Ohms Law.

$${\text{I}} = \frac{{\text{V}}}{{\text{R}}}$$ is the correct answer to “The formula to find $${\text{I}}$$ when the values of V and R are known is”. This question is standard in competitive examination syllabi for Ohms Law.

3.3 kΩ is the correct answer to “How much resistance is required to limit the current from a 12 V battery to 3.6 mA”. This question is standard in competitive examination syllabi for Ohms Law.

230 Ω is the correct answer to “What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source”. This question is standard in competitive examination syllabi for Ohms Law.