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What is the power in a circuit if the current is 5 amps and the total resistance is 125 ohms?
Ohm's Law: Voltage is current times resistance.
4 amperes times 125 ohms equals 500 volts.
Power Law: Watts is voltage times current
4 amperes times 500 volts equals 2000 watts.
WARNING: This is a lot of power. Do not attempt to duplicate this in the lab
without the proper equipment as there is great risk of fire.
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Power dissipated by a resistance = (current)2 x (resistance) = (4)2 x (125) = 2000 W.
As the first contributor noted, this is a healthy amount of power dissipation. It's not
necessarily dangerous if you're prepared for it . . . hair dryers, toasters, baseboard
heaters, electric stoves and furnaces do it every day. But if you're in the engineering
lab playing with a power supply and a bagful of 1/2-watt resistors, then things will not
work out as the math predicts, since the resistors are likely to explode catastrophically
before you have a chance to read the ammeter.
What else can I help you with?
What is the formula for total current in a series circuit?
Current = (Voltage across the circuit) divided by (Total resistance of the circuit). The current is the same at every point in the series circuit.
What is the total opposition to a current flow in an AC circuit with both resistance and reactance?
Resistance
As the resistance in a series circuit is decreased the amount of current in the circuit increases or decreases?
Increases the total resistance
In a parallel ac circuit is the current additive?
Yes In parallel circuit , current entering into the circuit will be divided intodifferent paths ( resistances) . Amount of current flow depends upon the magnitude of resistance applied in the circuit. Total current after passing through the circuit will be the sum of all current through each resistance.
Total amperage in a series circuit?
Voltage divided by total resistance will give the current. The resistance is simply the sum of all the individual resistances.
How is the resistance of a resister calculated?
ohms law calculation for a series circuit - Total Resistance = Total Voltage divided by Total Current
What is the formula for total current in a series circuit?
Current = (Voltage across the circuit) divided by (Total resistance of the circuit). The current is the same at every point in the series circuit.
What is describe as the total opposition to current flow in a circuit?
Total resistance.
What is the current that flows from and back to the power supply in a parallel circuit called?
The current that flows from and back to the power supply in a parallel circuit is called the total current. It splits into different branches based on the resistance of each branch but remains constant throughout the circuit.
When an ammeter is connected to measure current circuit current will decrease sightly because R total decreases after the meter is inserted?
Current will be decreased because of the resistance of the ammeter added to the circuit's resistance. In other words total resistance increases.
What is the total opposition to a current flow in an AC circuit with both resistance and reactance?
Resistance
Describe how a change in resistance would affect the current in a circuit?
As long as the voltage between the ends of the circuit remains constant, the current through the circuit is inversely proportional to the total effective resistance of the circuit.
As the resistance in a series circuit is decreased the amount of current in the circuit increases or decreases?
Increases the total resistance
A 120 ohm resistor a 60 ohm resistor and a 40 ohm resistor are connected in parallel to a 120 volt power source. What is the current running through the entire circuit?
6
Do additional resistors affect current in a series circuit?
Yes, additional resistors affect current in a series circuit by increasing the total resistance, which decreases the total current.
What is the affect of a series circuit on current?
by adding the the resistances in series the total resistance of the circuit increses and thus the crunt flowing in the circuit decrese. Ans 2 . the current in series circuit of constant resistance will always be the same . It will not effect the current .
In a parallel ac circuit is the current additive?
Yes In parallel circuit , current entering into the circuit will be divided intodifferent paths ( resistances) . Amount of current flow depends upon the magnitude of resistance applied in the circuit. Total current after passing through the circuit will be the sum of all current through each resistance.
