Podcast
Questions and Answers
What does Ohm’s law state about the relationship between voltage, current, and resistance?
What does Ohm’s law state about the relationship between voltage, current, and resistance?
- Resistance increases as voltage decreases.
- Voltage is inversely proportional to current.
- Current remains constant regardless of voltage changes.
- Current is directly proportional to the potential difference, given constant temperature. (correct)
If a circuit has a voltage of 15 V and a resistance of 3 Ω, what is the current flowing through the circuit?
If a circuit has a voltage of 15 V and a resistance of 3 Ω, what is the current flowing through the circuit?
- 45 A
- 5 A (correct)
- 0.2 A
- 3 A
Which of the following correctly rearranges Ohm's law to solve for resistance?
Which of the following correctly rearranges Ohm's law to solve for resistance?
- R = I/V
- R = I + V
- R = V/I (correct)
- R = V × I
In a circuit, if the current is 2 A and the voltage is 12 V, what is the resistance?
In a circuit, if the current is 2 A and the voltage is 12 V, what is the resistance?
Which component in a simple electric circuit is used to measure current?
Which component in a simple electric circuit is used to measure current?
What is the current (I) when the voltage (V) is 110 V and the resistance (R) is 550 Ω?
What is the current (I) when the voltage (V) is 110 V and the resistance (R) is 550 Ω?
How much resistance (R) is present if the voltage (V) is 230 V and the current (I) is 1.2 A?
How much resistance (R) is present if the voltage (V) is 230 V and the current (I) is 1.2 A?
What will be the voltage (V) in a circuit with a current (I) of 0.5 A and a resistance (R) of 100 Ω?
What will be the voltage (V) in a circuit with a current (I) of 0.5 A and a resistance (R) of 100 Ω?
If the current (I) is 0.0024 A in a circuit with a voltage (V) of 24 V, what is the resistance (R)?
If the current (I) is 0.0024 A in a circuit with a voltage (V) of 24 V, what is the resistance (R)?
How would you express 0.001 A in microamperes?
How would you express 0.001 A in microamperes?
What is the consequence of increasing the voltage in a circuit with a constant resistance according to Ohm’s law?
What is the consequence of increasing the voltage in a circuit with a constant resistance according to Ohm’s law?
If you double the resistance in a circuit with a constant voltage, how will the current be affected?
If you double the resistance in a circuit with a constant voltage, how will the current be affected?
When using a voltmeter in a circuit, what is it primarily measuring?
When using a voltmeter in a circuit, what is it primarily measuring?
Calculate the current (I) when the voltage (V) is 230 V and resistance (R) is 500 Ω.
Calculate the current (I) when the voltage (V) is 230 V and resistance (R) is 500 Ω.
What is the resistance (R) when the voltage (V) is 110 V and the current (I) is 0.2 A?
What is the resistance (R) when the voltage (V) is 110 V and the current (I) is 0.2 A?
Determine the voltage (V) if the current (I) is 0.0024 A and resistance (R) is 10 kΩ.
Determine the voltage (V) if the current (I) is 0.0024 A and resistance (R) is 10 kΩ.
What is the current (I) when the voltage (V) is 50 V and resistance (R) is 100 Ω?
What is the current (I) when the voltage (V) is 50 V and resistance (R) is 100 Ω?
What is the current (I) if the voltage (V) is 24 V and the resistance (R) is expressed as 10 kΩ?
What is the current (I) if the voltage (V) is 24 V and the resistance (R) is expressed as 10 kΩ?
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Study Notes
Ohm's Law
- Ohm's law defines the relationship between voltage (V), current (I), and resistance (R) in electrical circuits with the formula: V = I × R.
- The law illustrates that current is directly proportional to voltage when resistance is constant, applicable at a constant temperature.
- Units of measurement:
- Voltage (V) is measured in volts.
- Current (I) is measured in amperes (A).
- Resistance (R) is measured in ohms (Ω).
Georg Simon Ohm
- Georg Simon Ohm discovered the law governing the interaction between voltage, current, and resistance.
- The discovery is fundamental for understanding electrical circuits and is widely used in electrical engineering.
Practical Applications
- Ohm's law is commonly applied to determine unknown values in electric circuits:
- To find voltage (V), rearrange to V = I × R.
- To find current (I), use I = V / R.
- To find resistance (R), use R = V / I.
Worked Examples
- Example calculation for voltage:
- If I = 0.5 A and R = 20 Ω, then V = 0.5 A × 20 Ω = 10 V.
- Example calculation for current:
- For a load of 500 Ω with a supply of 230 V, the current is I = 230 V / 500 Ω = 0.46 A.
Practice Questions
- Formula rearrangements can help solve for V, I, or R:
- Given I = 0.5 A and R = 100 Ω, V = 0.5 A × 100 Ω = 50 V.
- For V = 110 V and R = 550 Ω, calculate I: I = 110 V / 550 Ω = 0.2 A.
- For V = 230 V and I = 1.2 A, calculate R: R = 230 V / 1.2 A = 191.67 Ω.
- If V = 24 V and R = 10 kΩ, then I = 24 V / 10,000 Ω = 0.0024 A.
Units and Conversions
- Common prefixes:
- M (mega) = 1,000,000
- k (kilo) = 1,000
- m (micro) = 0.000001
- Important conversions:
- 1 kΩ = 1,000 Ω; 10 kΩ = 10,000 Ω;
- 1 MΩ = 1,000,000 Ω.
Experimentation
- Connecting components in electric circuits, such as voltmeters, ammeters, loads, and power supplies, can verify Ohm's law through practical demonstrations.
Ohm's Law
- Ohm's law defines the relationship between voltage (V), current (I), and resistance (R) in electrical circuits with the formula: V = I × R.
- The law illustrates that current is directly proportional to voltage when resistance is constant, applicable at a constant temperature.
- Units of measurement:
- Voltage (V) is measured in volts.
- Current (I) is measured in amperes (A).
- Resistance (R) is measured in ohms (Ω).
Georg Simon Ohm
- Georg Simon Ohm discovered the law governing the interaction between voltage, current, and resistance.
- The discovery is fundamental for understanding electrical circuits and is widely used in electrical engineering.
Practical Applications
- Ohm's law is commonly applied to determine unknown values in electric circuits:
- To find voltage (V), rearrange to V = I × R.
- To find current (I), use I = V / R.
- To find resistance (R), use R = V / I.
Worked Examples
- Example calculation for voltage:
- If I = 0.5 A and R = 20 Ω, then V = 0.5 A × 20 Ω = 10 V.
- Example calculation for current:
- For a load of 500 Ω with a supply of 230 V, the current is I = 230 V / 500 Ω = 0.46 A.
Practice Questions
- Formula rearrangements can help solve for V, I, or R:
- Given I = 0.5 A and R = 100 Ω, V = 0.5 A × 100 Ω = 50 V.
- For V = 110 V and R = 550 Ω, calculate I: I = 110 V / 550 Ω = 0.2 A.
- For V = 230 V and I = 1.2 A, calculate R: R = 230 V / 1.2 A = 191.67 Ω.
- If V = 24 V and R = 10 kΩ, then I = 24 V / 10,000 Ω = 0.0024 A.
Units and Conversions
- Common prefixes:
- M (mega) = 1,000,000
- k (kilo) = 1,000
- m (micro) = 0.000001
- Important conversions:
- 1 kΩ = 1,000 Ω; 10 kΩ = 10,000 Ω;
- 1 MΩ = 1,000,000 Ω.
Experimentation
- Connecting components in electric circuits, such as voltmeters, ammeters, loads, and power supplies, can verify Ohm's law through practical demonstrations.
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