What quantities are related by Ohm’s law? Check all that apply.
voltage
conductivity
current
resistance
insulation
The quantities related by Ohm’s law are:
- Voltage (V)
- Current (I)
- Resistance (R)
Ohm's law, named after the German physicist Georg Simon Ohm, relates three quantities: voltage (V), current (I), and resistance (R).
According to Ohm's law, the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to the resistance of the conductor.
So, among the choices given, the quantities related by Ohm's law are:
- Voltage (V)
- Current (I)
- Resistance (R)
Conductivity and insulation, on the other hand, are not directly related to Ohm's law. However, they are related to the concept of resistance. Conductivity is the inverse of resistance and represents the ease with which a material conducts electric current, while insulation refers to the resistance of a material to the flow of electric current.
The quantities related by Ohm's law are:
- Voltage
- Current
- Resistance
Conductivity and insulation are properties of materials and are not directly related to Ohm's law.
A wire with a resistance of 20 Ω is connected to a 12-V battery. What is the current flowing through the wire?
A
To calculate the current flowing through the wire, we can use Ohm's law, which states that current (I) is equal to the voltage (V) divided by the resistance (R).
In this case, the voltage (V) is 12 V and the resistance (R) is 20 Ω.
The formula for Ohm's law is:
I = V / R
Plugging in the given values, we get:
I = 12 V / 20 Ω
Simplifying the equation, we find:
I = 0.6 A
Therefore, the current flowing through the wire is 0.6 Amps.
Rory uses a battery to power a light bulb with a resistance of 10 Ω. If 0.15 A of current is flowing, what is the voltage of the battery?
V
To determine the voltage of the battery, we can use Ohm's law, which states that voltage (V) is equal to the current (I) multiplied by the resistance (R).
In this case, the current (I) is 0.15 A and the resistance (R) is 10 Ω.
The formula for Ohm's law is:
V = I * R
Plugging in the given values, we get:
V = 0.15 A * 10 Ω
Simplifying the equation, we find:
V = 1.5 V
Therefore, the voltage of the battery is 1.5 volts.
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In the equation I = V over R. , what does I stand for?
In the equation I = V/R, the letter "I" stands for "current".
The current flowing through a lamp is 1.5 A. It is plugged into a 120-V outlet. What is the resistance of the lamp?
To calculate the resistance of the lamp, we can rearrange Ohm's law equation V = I * R, where V is voltage, I is current, and R is resistance.
In this case, the current I is 1.5 A and the voltage V is 120 V.
Rearranging the equation to solve for resistance R:
R = V / I
Plugging in the given values, we get:
R = 120 V / 1.5 A
Simplifying the equation, we find:
R = 80 Ω
Therefore, the resistance of the lamp is 80 ohms.
Calculate the potential difference across a 25-Ohm. resistor if a 0.3-A current is flowing through it.
V
To calculate the potential difference across a resistor, we can use Ohm's law, which states that the potential difference (V) is equal to the current (I) multiplied by the resistance (R).
In this case, the current (I) is 0.3 A and the resistance (R) is 25 Ω.
The formula for Ohm's law is:
V = I * R
Plugging in the given values, we get:
V = 0.3 A * 25 Ω
Simplifying the equation, we find:
V = 7.5 V
Therefore, the potential difference across the 25-ohm resistor is 7.5 volts.
How does the current in a circuit change if the resistance is doubled?
The current is halved.
The current is doubled.
The current is multiplied by four.
The current stays the same.
According to Ohm's law, the current (I) in a circuit is inversely proportional to the resistance (R). This means that as the resistance is doubled, the current will be halved. Therefore, the correct answer is "The current is halved."
A toy car has a 1.5-A current, and its resistance is 2 . How much voltage does the car require?
V
To calculate the voltage required by the toy car, we can use Ohm's law, which states that the voltage (V) is equal to the current (I) multiplied by the resistance (R).
In this case, the current (I) is 1.5 A and the resistance (R) is 2 Ω.
The formula for Ohm's law is:
V = I * R
Plugging in the given values, we get:
V = 1.5 A * 2 Ω
Simplifying the equation, we find:
V = 3 V
Therefore, the toy car requires a voltage of 3 volts.
Stu wanted to calculate the resistance of a light bulb connected to a 4.0-V battery, with a resulting current of 0.5 A. He used the formula R = VI and obtained an answer of 2 . Was Stu’s answer correct? How do you know?
Stu's answer of 2 ohms for the resistance of the light bulb is incorrect. We can determine this by examining the given information and using Ohm's law.
We are given that the voltage (V) is 4.0 V and the current (I) is 0.5 A. To calculate the resistance (R), we can rearrange Ohm's law:
R = V / I
Plugging in the given values, we get:
R = 4.0 V / 0.5 A
Simplifying the equation, we find:
R = 8 ohms
Therefore, the resistance of the light bulb is 8 ohms, not 2 ohms. Stu's answer is incorrect.
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To increase the amount of current flowing in a circuit, how should you change the voltage if the resistance stays the same?
To increase the amount of current flowing in a circuit while keeping the resistance the same, you should increase the voltage.
Which equation is correct according to Ohm’s law?
R = VI
V = I over R.
R = I over V.
V = IR