Question

secondary side
two spark plugs are connected to the secondary coil.
the secondary coil has approximately 100 times as many windings as the primary coil and thus generates a voltage 100 times greater.
the ends of the coil are connected to the spark plugs in series through the steel of the cylinder head.
when the change in the magnetic field occurs, one spark plug is supplied with a positive voltage, and the other spark plug is supplied with a negative voltage.
because the plugs are connected in series, a problem with either of the plugs/wires will affect the performance of the other. a plug will still fire every time even if its companion is disconnected, albeit with higher voltage.
under normal circumstances, a greater voltage is required by the spark plug under compression stroke because it takes more voltage to ionize the gap when the cylinder is under pressure. however, if one of the secondary ignition wires has high resistance, it will consume more of the available voltage (even on the wasted spark event). this takes voltage away from where its needed which will result in a possible misfire.
the secondary coil generates 10,000 volts.
a measurement shows that 2000 volts are across the spark plug of cylinder 2.
how many volts are across the spark plug of cylinder 3?

Explanation:

Step1: Recall series - circuit voltage rule

In a series circuit, the sum of the voltages across each component is equal to the total voltage. Let \(V_{total}\) be the voltage of the secondary coil, \(V_2\) be the voltage across cylinder 2's spark - plug, and \(V_3\) be the voltage across cylinder 3's spark - plug. The formula is \(V_{total}=V_2 + V_3\).

Step2: Solve for \(V_3\)

We know that \(V_{total}=10000\space V\) and \(V_2 = 2000\space V\). Rearranging the formula \(V_3=V_{total}-V_2\). Substitute the values: \(V_3=10000 - 2000\).

Answer:

\(8000\)