Which statement describes the relationship of resistance and current?
Resistance is directly proportional to current because R = V over I..
Resistance is inversely proportional to current because R = .
Resistance is directly proportional to current because R = VI.
Resistance is inversely proportional to current because R = VI.
Resistance is inversely proportional to current because R = V/I.
The correct statement is:
Resistance is directly proportional to current because R = V / I.
The correct statement is: Resistance is directly proportional to current because R = V / I.
To understand this relationship, we need to recall Ohm's Law, which states that the current passing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor.
Ohm's Law is expressed as:
V = I * R
where V represents the voltage, I represents the current, and R represents the resistance.
To solve for resistance, we rearrange the equation:
R = V / I
This equation shows that the resistance of a conductor is equal to the voltage across it divided by the current passing through it. Therefore, resistance is directly proportional to current. When current increases, resistance increases proportionally, and when current decreases, resistance decreases proportionally.
So, the correct statement is: Resistance is directly proportional to current because R = V / I.
A hair dryer has a resistance of 11.5 . What current does it conduct when it is plugged into a wall outlet that provides 120 V?
0.10 A
10.4 A
109 A
1380 A
To determine the current (I) flowing through the hair dryer when plugged into the wall outlet, we can use Ohm's Law, which states that current is equal to voltage divided by resistance (I = V/R).
Given:
Resistance (R) = 11.5 Ω
Voltage (V) = 120 V
Plugging in these values to Ohm's Law, we have:
I = 120 V / 11.5 Ω
Calculating this equation, we find:
I ≈ 10.4 A
Therefore, the current flowing through the hair dryer when plugged into a 120 V wall outlet is approximately 10.4 A. Option B, 10.4 A, is the correct answer.
What is the resistance of a light bulb if a potential difference of 120 V will produce a current of 0.5 A in the bulb?
0.0042
0.5
60
240
To find the resistance (R) of a light bulb, we can rearrange Ohm's Law (I = V/R) to solve for resistance:
R = V/I
Given:
Potential difference (V) = 120 V
Current (I) = 0.5 A
Plugging in these values to the equation, we have:
R = 120 V / 0.5 A
Calculating this equation, we find:
R = 240 Ω
Therefore, the resistance of the light bulb is 240 Ω. Option D, 240, is the correct answer.
According to Ohm’s law, which combination of units is the same as the unit for resistance?
volt ÷ ampere
ampere × volt
volt + ampere
ampere ÷ volt
According to Ohm's Law, the unit of resistance is volt divided by ampere. Therefore, the correct combination of units that is the same as the unit for resistance is ampere ÷ volt.
Which symbol and unit of measurement are used for voltage?
symbol: V; unit: A
symbol: R; unit :
symbol: V; unit: V
symbol: R; unit: V