Electrical testing (Triumph Street Triple 765, 4 generation, 2017-2024) [Information for owner: Introduction to manual]

For any electrical system to work, electricity must be able to flow in a complete circuit from the power source (the battery) via the components and back to the battery. No circuit means no electrical flow. Once the power has left the positive side of the battery and run through the component it must then return to the battery on its negative side (this is called earth or ground). To save on wiring, connections and space, the negative side of the battery is connected directly to the frame or engine. Around the frame and engine will be various other ground points to which the wiring coming from components will be connected. In the case of the starter motor it bolts directly to the engine, which is bolted to the frame. Therefore the frame and engine also form part of the earth return path.

Ohm's law

The relationship between voltage, current and resistance is defined by Ohm's Law.

The potential of a battery is measured in volts (V).
The flow of current in a circuit (I) is measured in amperes.
The power rating of a consumer is measured in watts (W).
The resistance (R) of a circuit is measured in Ohms.

Ohm's law, for practical work can be described as -

Power is calculated by multiplying Volts x Amps -

By transposing either of these formulae, the value of any unit can be calculated if the other two values are known.

For example, if a battery of 12 V is connected to a bulb of 60 W:

the current flowing in the circuit can be calculated by using -

the bulb resistance can be calculated by using -

To use either of the following triangles, put your finger over the value you want to find. Multiply the remaining values if side by side, or divide if one is over the other.

Electrical testing (Triumph Street Triple 765 R/RS)

Ohm's law