Question about electricity

[Yoga Face]

If a voltage is doubled then the amperage is halved this means the resistance has quadrupled as V=a*ohms


how is the resistance quadrupled when it is the same thing resisting and why would more voltage mean less electrical flow?

 

[FAST]

Energy in = energy out

Another simple way to explain the question here,...the field created by the prImary of the transformer has a specific amount of electrical energy.

Therefor,...the energy, electrical power/watts, induced into the secondary CANNOT be any greater,...simple as that.

FAST

 

[Yoga Face]

Another simple way to explain the question here,...the field created by the prImary of the transformer has a specific amount of electrical energy.

Therefor,...the energy, electrical power/watts, induced into the secondary CANNOT be any greater,...simple as that.

FAST

Understood but how can this be ??? the same thing resisting has a dramatic increase in resistance? Voltage is the pushing force how can increasing this force result in less pushing ?

 

[IM469]

If a voltage is doubled then the amperage is halved this means the resistance has quadrupled as V=a*ohms


how is the resistance quadrupled when it is the same thing resisting and why would more voltage mean less electrical flow?

The same thing is not resisting - you are not changing the voltage to drive the same resistance. If you take your 120V table radio and plug it into a Euro power outlet of 240 volts - it will blow up. This is because the resistance has stayed the same when the voltage has doubled and as you pointed out - the current is now twice as high and the radio draws too much power.

If a radio draws 120 watts of power to operate on a 120V circuit it will draw 1 amp ( 120V x1Amp=120 Watts). In Europe that 120 Watt radio requires 0.5 Amp (240V x 0.5A = 120 Watts). To operate at the same power on double the voltage - the resistance must be twice as high.

Your observations are correct, you just must accept that required resistance also changes as you change the voltage with the same power.

Have I helped at all ?

 

[Yoga Face]

The same thing is not resisting - you are not changing the voltage to drive the same resistance. If you take your 120V table radio and plug it into a Euro power outlet of 240 volts - it will blow up. This is because the resistance has stayed the same when the voltage has doubled and as you pointed out - the current is now twice as high and the radio draws too much power.

If a radio draws 120 watts of power to operate on a 120V circuit it will draw 1 amp ( 120V x1Amp=120 Watts). In Europe that 120 Watt radio requires 0.5 Amp (240V x 0.5A = 120 Watts). To operate at the same power on double the voltage - the resistance must be twice as high.

Your observations are correct, you just must accept that required resistance also changes as you change the voltage with the same power.

Have I helped at all ?

Appreciate your help as this is a new concept to me

In a step up transformer the voltage increases at the power plant

There has been no increase in resistance because the voltage is being applied to a hydro wire that is built to handle more voltage ? and the resistance does not magically increase as more voltage is applied for as you pointed out the radio would blow up

 

[larry]

is this a serious thread? c'mon.