def METHOD_NAME(self) -> Tuple[int, int, int]:
    """output() -> Tuple[int, int, int]
    Measures the electrical signals at the output (top) side
    of the energy meter. It measures the voltage applied to the external
    load and the current passing to it. The product of these two values
    is power. This power value is the rate at which the stored energy
    decreases. This power is consumed by the load, such as a light or a
    motor.
    Returns:
        Voltage (mV), current (mA), and power (mW) measured at the output
        port.
    """