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A flashlight bulb with a potential difference of 4.5 V across it's filament has a power to output 8.0 W how much current is in the bulb filament?
Wiki User
∙ 13y ago
A few comments first of all. Current flows 'through', not 'across'. There is no such thing as 'electrical power'; power is power -period! The symbol for volts is 'V', not 'v'.
To answer your question, you can find the power of the lamp using the equation: P = U I
where:
P = power in watts
U = potential difference in volts
I = current in amperes
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoDivide the Watts by the Volts and you get Amps.
8Watts / 4.5 Volts = 1.7777777777777 Amps
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Does potential difference change with change in resistance?
Changing the potential difference in a circuit does not change the resistance. Rather, it changes the current.
How can you determine the resistance of a current?
Voltage = Current x Resistance giving us Current = Voltage / Resistance i.e. Voltage divided by resistance
What is the difference between potential difference and current?
think of potential as pressure and current as flow. you can have pressure in a water hose with out flow. open the valve and current happens. The difference in potential divided by the impedance is equal the current.
What is produced first current or voltage?
current flows as a result of potential difference i.e. in a circuit if there is no voltage difference between two points, no current can flow between those two points. So voltage has to be produced first.
Difference between potential transformer and current trasnformer?
The difference between current transformer and potential transformer is that the secondary of a current transformer can not be open circuited while under service whereas that of the potential transformer an be open circuited without any damage to the transformer.
When the flashlight is on is it static or current electricity?
When the flashlight is ON , electrical current is flowing from one terminal of thebattery, through the light-bulb filament, to the other terminal of the battery.
What is the difference between filament current and tube current?
The current supplied to the filament for heating is defined as the Filament current. whereas When the filament is heated to a high temperature, the electrons are emitted. The flow of electrons form Cathode to anode is the tube Current.
What are the 4 forms of energy used for a flashlight?
Chemical (battery), electrical (current), thermal (filament), and radiant (light).
Is current produced with out potential difference?
No.
What is filament current?
The current supplied to the filament of an electron tube for heating.
Current is proportional to the potential difference and inversely proportional to its?
Current is proportional to the potential difference and inversely proportional to resistance. Ohm's law: Current equals voltage divided by resistance
The difference between charge and current?
Charge is potential, current is flowing.
Why potential difference is necessary for the flow of current?
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How does voltage produce current?
Voltage across two terminals mean there exists a potential difference, and when the circuit gets closed, due to this potential difference the current flow.
What is the potential difference across a 1500 ohm resistor carrying a current of 0.075 A?
Potential Difference across a resistor is given by, Potential Difference = Resistance * Current = 1500 * 0.075 = 112.5 Volts
If the potential difference between two points increases what will the current do?
If the potential increase and resitance remain the same ,the current will encrease
Does a lamp with a thick filament draw more current or less current than a lamp with a thin filament?
A lamp with a thick filament will draw more current. What restricts the current flow in the filament is the resistance of the filament which increases as the temperature of the filament increases. A thin filament requires less energy to get heated up that a thick one so less current to achieve threshold resistance. Also a thick filament provides a broader path for current so there is less resistance per increase in degree centigrade. For these two (closely related but distinct) reasons it will require more current for the filament to get heated up to threshold resistance.
