What will be the current in 8 ohm resistor?
1 Ampere
How do you calculate amps from volts and ohms?
Ohms Law and Power
- To find the Voltage, ( V ) [ V = I x R ] V (volts) = I (amps) x R (Ω)
- To find the Current, ( I ) [ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)
- To find the Resistance, ( R ) [ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)
- To find the Power (P) [ P = V x I ] P (watts) = V (volts) x I (amps)
What is the voltage of a circuit with 15 amps of current and 8 ohms of resistance?
Answer. HENCE, VOLTAGE IS 120V.
What is the resistance of a 7.5 amp circuit?
Answer: The circuit resistance will be 2 ohms.
What four things does the resistance of a wire depend on?
The resistance depends on the length of the wire, material, thickness, and temperature.
What is the resistance of a 100 watt 120 volt bulb?
For example, a 100 watt light bulb operating on 120 volts AC will have 144 ohms of resistance and will draw 0.833 Amps.
How many amps does a 100 watt bulb use?
8.3 amps
What is the resistance of a 60w light bulb?
240 Ω.
What is the resistance of a 60-watt light bulb operated at 120 volts?
240 Ω
What is the resistance of a 100w light bulb?
about 9.5 ohms
When a 60 watt light bulb is connected to a 120 volt source the current in the light bulb is?
Physics 4-26
| Question | Answer |
|---|---|
| A battery does 18J of work on 10 coulombs of charge. What voltage does the battery supply? | 1.8 V |
| What is the current in a 60W bulb connected to a 120V source? | 0.5 Amps |
| What is the power dissipated by a toaster that has a resistance of 40 ohms and is plugged into a 120 V outlet? | 360 Watts |
What is the resistance in a lightbulb with a voltage of 25 V and a current of 0.2 A?
The resistance for the lightbulb is 125 Ω.
What happens to the current in a circuit if a 10 resistor is removed and replaced by a 20 resistor?
What happens to the current in a circuit if a 10Ω resistor is removed and replaced by a 20Ω resistor? I = 10Ω → 20Ω For the same voltage, current decreases. 13.
What happens to current if the voltage is increased and the resistance stays the same?
Answer. Explanation: The current is directly proportional to the voltage and inversely proportional to the resistance. This means that increasing the voltage will cause the current to increase, while increasing the resistance will cause the current to decrease.
What will happen to the current if resistance is doubled while voltage is kept constant?
Answer: The current is inversely proportional to the resistance. This means that with a constant voltage source in the input, then current will decrease in half if resistance is doubled.
What happens to current If voltage is doubled?
The current is directly proportional to the voltage and inversely proportional to the resistance. Any alteration in the voltage will result in the same alteration of the current. So doubling or tripling the voltage will cause the current to be doubled or tripled. The new current will be 0.5 • I.
Does current affect 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.
Does voltage increase with resistance?
Ohm’s law states that the electrical current (I) flowing in an circuit is proportional to the voltage (V) and inversely proportional to the resistance (R).
Does Resistance reduce voltage?
Voltage varies directly with current. “R” is the constant of proportionality telling how much it varies. If I add in a resistor to a circuit, the voltage decreases. If you have a resistor in a circuit, with a current flowing through it, there will be a voltage dropped across the resistor (as given by Ohm’s law).
Why is resistance directly proportional to voltage?
In other words, the current is directly proportional to the voltage and inversely proportional to the resistance. So, an increase in the voltage will increase the current as long as the resistance is held constant. If the current is held constant, an increase in voltage will result in an increase in resistance.
Why does voltage decrease when resistance increases?
The current is directly proportional to the voltage and inversely proportional to the resistance. This means that increasing the voltage will cause the current to increase, while increasing the resistance will cause the current to decrease.
What happens to current if resistance increases?
Likewise, if we increase the resistance, the current goes down for a given voltage and if we decrease the resistance the current goes up. Which means that if resistance is high current is low and if resistance is low current is high.
Does increasing voltage increase power?
Volts and Amps There are multiple ways to get there. As long as you can draw enough current (amps) from the battery, you can get the same amount of power out of many voltages. So theoretically, the higher voltage doesn’t mean more power in and of itself.