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There is a separate circuit on models that have air so it probably feeds thru there.If the coolant sensor/switch is not calling for the fan to come on (usually 194 degrees F) it won't come on. The fan does not run as must as you think it should.

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Resistance is connected in parallel with voltmeter or say, voltmeter is connected in parallel with resistance.

Upper is hose connected to top of radiator, lower is hose connected to bottom of radiator.

When many resistances are connected in series, the equivalent resistance is greater than the greatest single resistance. When many resistances are connected in parallel, the equivalent resistance is less than the smallest single resistance.

No. Load resistance is the value of the element actually doing the work of the circuit it is connected to. A speaker connected to an amplifier is the load.

There is no 'equivalent resistance' for three resistors connected in star.

An ohm meter is connected across the resistance that is to be measured.

Real-world batteries do not have zero internal resistance. When one connects a load (resistance) to a battery, current begins to flow and the open-circuit potential is divided between the battery's internal resistance and the resistance of the load. Thus, one will measure a lower voltage at the battery terminals when a load is connected, compared to no-load conditions.

No change in supply voltage as additional resistance is connected in parallel circuit.

If additional resistance is connected in parallel with a circuit the supply voltage will decrease?

Two resistors connected in parallel are 1/2 the sum of their resistance. The resistance of two resistors connected in series is the sum of their resistance. For example: The total resistance of a 100 ohm resistor connected to a 200 ohm resistor in parallel is 100+200 divided by 2 = 150 ohms. The total resistance of a 100 ohm resistor connected to a 200 ohm resistor in series 100+200= 300 ohms.

Well, the total circuit resistance depends on the type of connection. If the two resistances (or any number of resistances) are connected in series, IE. one resistance end is connected to one end of another resistance, the the circuit total resistance is the sum of the two resistances. say two resistances r1 and r2 are connected in series the total resistance is r1+r2 (in this case its 30 ohms). If the resistances are connected in parallel IE. both the ends of a resistance are connected to both ends of another resistance then the total resistance in this case shall be (r1*r2)/(r1+r2) ,( that is 6.67 ohms in given case).

That is the lower hose and the one connected to the radiator is the upper one..

Resistance connected either series the current get increases

Two 1 ohm resistors connected in series have a combined resistance of 2 ohms.

The net resistance of two resistors connected in series is the sum of the two resistances. RSERIES = Summation1toN RN

resistivity is the resistance of unit specimen. resistance means the whole resistance offered by the conductor . resistivity depends only on temperature but not on shape and size of the conductor .( if we compare with mass and density, resistivity can be compared with density and resistance can be compared with mass)

If they're connected in series the total resistance is 2000 ohms. If they're connected in parallel the resistance is 500 ohms.

underneath the batery

In the canister that's connected to the radiator.

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Yes. It NEEDS a source to be connected.

In principle, it is infinite. I have not connected a parallel circuit in ages.

an ideal ammeter has zero or negligible resistance when this is connected in series no effective resistance would be added in the circuit so that the value of curret that we get is exactly of the circuit only. but when the ammeter is connected in parllel as it has zero resistance , the resistor to which it is connected in parllel gets shorted and due to his the effective resistance of the circuit is changed and so the effective current ... due to this the w=value measured by the ammeter would be different (incresed due to dec. in effective resistance)

The radiator hose which I assume you mean although you write rad, is connected to the radiator. One on the top of the radiator and one on the bottom. the one on the top

yes ,they can be connected ,then they both will drive the current through that resistance ,the current through that resistance will be the sum of currents due to each individual source taking only one at a time (use superpositon theorem)