Which statement best describes the relationship of resistance and current?
resistance is directly proportional to current because r = vi.
Which statement best describes the relationship between resistance and current?
Answer Expert Verified. Answer: Option (b) is the correct answer. Explanation: According to ohm’s law, the relationship between voltage, resistance, and current is that current passing through a conductor is directly proportional to the voltage over resistance.
What is the product of resistance and current in Ohm’s law?
Alternate statements of Ohm’s law are that the current I in a conductor equals the potential difference V across the conductor divided by the resistance of the conductor, or simply I = V/R, and that the potential difference across a conductor equals the product of the current in the conductor and its resistance, V = IR …
What is 1 ohm resistance?
1 Ohm is defined as the resistance of a conductor with a potential difference of 1 volt applied to the ends through which 1-ampere current flows. Ohms is the SI unit of electrical resistance.
What is current formula?
Current is usually denoted by the symbol I. Ohm’s law relates the current flowing through a conductor to the voltage V and resistance R; that is, V = IR. An alternative statement of Ohm’s law is I = V/R.
How many ohms does a 12 volt battery have?
In a battery of 12 Volts with an internal resistance of 1 ohm and a load of 6 ohms the current expected at the load would be 2 amps. The actual current is 12-Volts / 7 Ohms equals 1.7 Amps. Also (remember the voltage law) the source voltage is equal to all the voltage drops around the circuit.
How do you find the internal resistance of a 12 volt battery?
The typical way to measure the internal resistance of a battery, that I’ve found through research, is by connecting the battery in a circuit with a resistor, measuring voltage through the battery, calculate current, measure voltage through the resistor, find the voltage drop and use kirchoff laws to calculate the …
How do you convert ohms to volts?
So volts are equal to the square root of watts times ohms:
- volts = √watts × ohms.
- V = √W × Ω
- V = √2W × 12.5Ω = 5V.
What is the maximum internal resistance of a 12v car battery?
0.02 ohms
What causes internal resistance?
Sulfation and grid corrosion are the main contributors to the rise of the internal resistance with lead acid. Temperature also affects the resistance; heat lowers it and cold raises it. Heating the battery will momentarily lower the internal resistance to provide extra runtime.
What is a good car battery internal resistance?
The resistance of a miniature watch battery might be 100 ohms or so. A torch battery has an internal resistance of around 0.1 ohms and a car battery about 0.001 ohms. Our imaginary internal resistor obeys Ohm’s law just like any other resistor.
What is the resistance of a battery in real life?
Though the internal resistance may be or appear low, around 0.1Ω for an AA alkaline battery, and about 1Ω to 2Ω for a 9-volt alkaline battery, it can cause a noticeable drop in output voltage if a low-resistance load is attached to it….Battery Internal Resistance.
| Battery | Internal Resistance |
|---|---|
| 76 silver | 10Ω |
| 675 mercury | 10Ω |
Do wires have resistance?
An electric current flows when electrons move through a conductor, such as a metal wire. This makes it more difficult for the current to flow, and causes resistance. The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through.
What is the difference between resistance and internal resistance?
Answer. internal resistance is the rsisitance offered by the electrolyte to the flow of electrons. external resistance is the resistance offered to the flow of electricity in the external circuit.
What should be the resistance of ammeter?
The resistance of an ammeter should be low. An ammeter has to be connected in series with the circuit to measure current. In case, its resistance is not very low, its inclusion in the circuit will reduce the current to be measured. In fact, an ideal ammeter is one which has zero resistance.
Which of the following has maximum resistance?
Answer. Because the resistance of an ideal voltmeter is considered infinite and due to this reason it is always connected in parallel with the branch whose voltage has to be measured.