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Resistors are not usually given 'current ratings' but, rather, 'power ratings' expressed in submultiples of the watt. It is then up to the user to calculate the safe maximum operating current for a particular resistor, by manipulating the equation: P = I2 R.
Since a power rating is dependent upon the resistor's ability to dissipate energy by heat transfer, the actual power rating is dependent upon the surface area and, hence, the physical size of the resistor. So you will find that resistors come in a variety of physical sizes for any given resistance value.
Unfortunately, power ratings are not indicated through colour codes, etc., so you will have to either specify its power rating when you purchase a resistor, or match your existing resistor against a scale-drawing to determine its power rating.
What else can I help you with?
What is a led resistor?
A LED resistor is a resistor used in conjunction with a light-emitting diode (LED) to limit the current flowing through the LED. It prevents excessive current that can damage the LED, ensuring it operates within its specified voltage and current ratings. The value of the resistor is calculated based on the supply voltage, the forward voltage of the LED, and the desired current. This setup is essential in LED circuits to maintain longevity and functionality.
Which resistor had the smallest current through it when the v was 12v?
To determine which resistor had the smallest current through it when the voltage (v) was 12V, we can apply Ohm's Law (I = V/R). The resistor with the highest resistance (R) will have the smallest current (I) for a given voltage. Therefore, if you know the values of the resistors in the circuit, the one with the highest resistance will have the smallest current flowing through it when 12V is applied.
A can be used to reduce the current in a circuit?
A resistor.
What is the voltage drop across a 100 W resistor when the electric current flowing through it is measured at 250 mA?
Who can tell? The power rating of a resistor simply tells us the maximum power that resistor is capable of handling; it doesn't tell us anything about the actual power being produced for any given current. So, to find out the voltage drop across that resistor, you will need to find out its resistance, and multiply this value by the current you specify.
What is series dropping resistor?
A series dropping resistor is a resistor that limits the amount of current flow in a circuit.
How do you connect in order to produce a maximum current in a given external resistor?
in parallel
What is the current flowing through a 200 watt resistor that has a rating of 21 ohms?
The current can't be calculated from the information given in the question.The power rating of a resistor is the maximum power it can dissipate before it overheatsand its resistance possibly changes permanently. The power rating is not the amount ofpower it always dissipates.So, all we really know about the resistor in the question is that its resistance is 21 ohms.And all we can say about the current through it is:Current through the resistor = (voltage between the ends of the resistor) divided by (21).
What is the formula of calculating effective current if resistor and voltage is given?
I = E/R or Current = Voltage/Resistance (Ohm's Law)
What is the unit of the resistors?
Resistor values are given in ohms. A value may be selected to deliver a specific current at a given voltage. This is given in what is known as Ohm's Law where: Voltage (V) = Current (A) X Resistance (Ohm) A 12ohm resistor placed across a 12V battery would pass 1Amp of current and put out 12W of heat.
What is the unit of measures for resistors?
Resistor values are given in ohms. A value may be selected to deliver a specific current at a given voltage. This is given in what is known as Ohm's Law where: Voltage (V) = Current (A) X Resistance (Ohm) A 12ohm resistor placed across a 12V battery would pass 1Amp of current and put out 12W of heat.
What does it mean if resistor x is steeper then resistor y?
If resistor X is steeper than resistor Y in a voltage versus current graph (I-V curve), it indicates that resistor X has a lower resistance value compared to resistor Y. The steeper slope means that for a given increase in voltage, resistor X allows a greater increase in current, following Ohm's Law (V = IR). Therefore, resistor X conducts more current than resistor Y for the same voltage applied.
How does current change through a resistor?
When an electric current flows through a resistor, the resistor resists the flow of the current, causing a decrease in the current. This decrease in current is proportional to the resistance of the resistor, as described by Ohm's Law.
What is a led resistor?
A LED resistor is a resistor used in conjunction with a light-emitting diode (LED) to limit the current flowing through the LED. It prevents excessive current that can damage the LED, ensuring it operates within its specified voltage and current ratings. The value of the resistor is calculated based on the supply voltage, the forward voltage of the LED, and the desired current. This setup is essential in LED circuits to maintain longevity and functionality.
Does current flow through a resistor, or does it flow across a resistor?
Current flows through a resistor, not across it.
How micro ohm meter work in detail?
A current is passed through a resistor and the voltage drop is measured on the other side. It follows Ohm's law by a given current and voltage you can measure the resistance of a resistor by V=IR.
What is the current through the 4000Ω resistor in mA?
Without more information on the circuit this resistor is in, no answer can be given. This sounds like a homework question, where a schematic is given in the book. Please consult the schematic in your book and you should be able to answer it for yourself.
Which resistor had the smallest current through it when the v was 12v?
To determine which resistor had the smallest current through it when the voltage (v) was 12V, we can apply Ohm's Law (I = V/R). The resistor with the highest resistance (R) will have the smallest current (I) for a given voltage. Therefore, if you know the values of the resistors in the circuit, the one with the highest resistance will have the smallest current flowing through it when 12V is applied.
