Doc is absolutely correct. All circuit #1 would do is fry your battery in very short order!
Some mention of fusing for these circuits might not go amiss at this point? ALL wiring circuits in a model should be afforded overload and short circuit protection. The easiest way to achieve this is by inserting an auto fuse (or similar) of the correct rating in the initial (positive) leg of the circuit needing protection. Use a fuse value that is closest to, but above, the normal operating current (in Amps) of the circuit.
Modellers think of DC supplies in model boats as being pretty benign - it's difficult to get any meaningful electric shock at the normally used voltages, BUT BEWARE, short circuits that are unprotected can very quickly turn into serious fires. A short circiut might be defined as one where there is a continuous current path across the supply terminals of the power source, i.e. no device with inherent resistance in circuit.
The differences between DC (Direct Current) and AC (Alternating Current) are also worthy of mention, if only for general interest, with regard to short circuits and protection:
In a DC circuit, a short will cause an exponential and continual increase in current until someting gives, either a fuse blowing if one is fitted, or if one isn't fitted, the wiring or some other component burning until the circuit breaks itself. At higher voltages, DC circuitry is highly dangerous and has to be very carefully designed.
In simplistic terms, in an AC circuit the current reverses direction (a sinusoidal wave form) at the designed frequency, typically 50 cycles per second (Hertz) on the UK national grid. This does vary from country to country around the world. Fast operating fuses, or more commonly these days, circuit breakers, for AC circuits are mostly designed to blow or trip often within half of one cycle i.e. within 100th of 1 second. The current draw on the circuit does increase, but for such a short duration that the consequential damage is minimal. ELCB's (Earth Leakage Circuit Breakers detect current in the Earth path of the device and trip the breaker in the shortest practicable time. These have largely been replaced by RCD's in modern installations (see later post).
Given the choice, from a personal safety perspective, I would rather work on AC circuitry all the time, particularly at anything above 24 Volts.
Another word of warning, electric shocks from voltages as low as 24V have been known to kill people with certain heart conditions. And on that happy note....
My best regards,
Malcolm