# Ohmic And Non Ohmic Devices

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Quizzes Created: 6 | Total Attempts: 8,634
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• 1.

### The current flowing in an Ohmic device was measured at 3 Amps. If the supply Voltage was 9 Volts what was the Resistance across the device?

• A.

0.33 Ohms

• B.

3 Ohms

• C.

27 Ohms

• D.

Cannot be determined

B. 3 Ohms
Explanation
The resistance across the device can be determined by using Ohm's law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the voltage is given as 9 volts and the current is given as 3 amps. Therefore, the resistance can be calculated as 9 volts divided by 3 amps, which equals 3 ohms.

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• 2.

### The Voltage across an Ohmic device is 12 Volts after 4.9 Ohms of Resistance was applied. The current flowing through the device is:

• A.

58.8 Amps

• B.

0.41 Amps

• C.

4 Amps

• D.

2.45 Amps

D. 2.45 Amps
Explanation
The current flowing through the device can be calculated using Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). In this case, the voltage across the device is given as 12 Volts and the resistance is given as 4.9 Ohms. Therefore, the current can be calculated as 12V/4.9Ω = 2.45 Amps.

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• 3.

### Is this an Ohmic or Non Ohmic device? How can you tell?

• A.

An ohmic device. The resistance is constant for all currents and voltage shown by same gradient

• B.

An ohmic device. The resistance is not constant for all currents and voltage shown by changing gradient of the graph

• C.

A non-ohmic device. The resistance is constant for all currents and voltage shown by same gradient

• D.

A non-ohmic device. The resistance is not constant for all currents and voltage shown by changing gradient of graph

D. A non-ohmic device. The resistance is not constant for all currents and voltage shown by changing gradient of graph
Explanation
The correct answer is A non-ohmic device. The resistance is not constant for all currents and voltage shown by changing gradient of graph. This is because in an ohmic device, the resistance remains constant regardless of the current or voltage applied. However, in this case, the graph shows a changing gradient, indicating that the resistance is not constant and therefore the device is non-ohmic.

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• 4.

### Looking at the graph: What is the resistance of the device as a current of 2 Amps passes through it?

• A.

4 Ohms

• B.

2.5 Ohms

• C.

3.5 Ohms

• D.

1 Ohm

A. 4 Ohms
Explanation
Based on the graph, the voltage across the device when the current is 2 Amps is approximately 8 Volts. Using Ohm's Law, we can calculate the resistance as:
R = V / I = 8 V / 2 A = 4 Ohms
Therefore, the resistance of the device as a current of 2 Amps passes through it is 4 Ohms.

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• Current Version
• Feb 13, 2024
Quiz Edited by
ProProfs Editorial Team
• Mar 09, 2020
Quiz Created by
CB

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