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Formula to Calculate Amperes for Driving an Amplifier: Watts, Volts, and Ohms Relation

xzibit 34677 7
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 6549078
    xzibit
    Level 10  
    Hello
    What is the formula for calculating the need in amperes to drive an amplifier?
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  • #2 6549127
    Mihas66
    Level 22  
    A friend is probably ridiculous, he is even in junior high ... P = U * I or I = P / U and the next time is the demand for electricity and not somehow in Ruthenian calculating the demand in amperes ... I suggest to know the law Ohm R = U / I and two Kirchhoff's laws, but by the way ... Tell me what kind of amplifier it is, because it feels like you count it wrong, notice that the amplifier never has 100% efficiency because it is practically impossible ...
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  • #3 6549141
    xzibit
    Level 10  
    I mean an amplifier

    JBL GTO 3501E

    RMS power, 4 Ohm 1 x 225 W
    RMS power, 2 Ohm 1 x 360 W
    THD 0.04%
    signal / noise ratio> 104 dB
    frequency response 20Hz - 330Hz
    Crossover active 32-320 Hz
    LP and HP crossover settings
    high-pass filter 10 - 100 Hz
    low-pass filter 32 - 320 Hz
    crossover slope 12 dB / oct
    input sensitivity 230mV - 5.8V
    smooth bass boost + 12dB at 45Hz

    It needs how many amps at 12V must be to drive it.
  • #4 6549182
    KubeqZ
    Level 16  
    i.e. max 360W .. well, it's about 30A, but it's better to provide some reserve, i.e. about 35-40A
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  • #5 6549195
    jur1
    DVD technology specialist  
    If you have a fuse in the amplifier, next to the socket for the power supply cables of the amplifier, look at it and you will know how much electricity this baby can draw.
  • #6 6549221
    xzibit
    Level 10  
    I do not have an amplifier yet, I am asking myself because I am going to buy it and have it at home for a while, and I need to drive it somehow. :) A 4ohm bass box with 300W RMS power will be attached to it.

    Added after 44 [minutes]:

    Is there any other way to power it at home besides the battery? Because I can see that computer power supplies do not have that many amps at 12V.
  • #7 6550844
    gilus1
    Level 29  
    A transformer with a power of about 500W and a secondary voltage of about 9-10V, 4 rectifying diodes for 50A and some filtering capacitor. It seems to me that there is no need to insert a stabilizer, because then the price of the power supply will increase significantly. Powerful computer power supplies have several 12V lines and are not connected to a single source. Additionally, the power supply for the computer is a switching power supply. The amplifier works on it, but not as it should.
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  • #8 6550849
    lukis1991
    Level 11  
    look on the net (you will probably also find on the electrode) some power supply diagram and choose the parameters there for yourself ... or maybe some battery charger .. but I doubt that you will find such a large ampere ...
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Topic summary

The discussion centers around calculating the amperage required to drive a JBL GTO 3501E amplifier, which has an RMS power output of 225W at 4 Ohms and 360W at 2 Ohms. The formula for calculating amperes is provided as I = P / U, where P is power in watts and U is voltage in volts. It is suggested that for optimal performance, a current supply of 35-40A is recommended, considering the amplifier's maximum power draw. Additionally, alternatives for powering the amplifier at home are explored, including the use of a transformer and rectifying diodes, as well as the limitations of standard computer power supplies.
Summary generated by the language model.
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