Definitely.
answer yes the mouse has probaly also chewed thru wires causing a short
how to build a diesel heater
the heater core
Your heater core may have gone out. Or you could have build-up in the lines.
you put one on top of the other repeatedly
The ticking could be just the pipes expanding and contracting. Or, the heating elements could have a build up that occurs over time.
6.8 ohms is a standard value, and 6.8 is within 0.74% of 6.75. If you need a precise value, use a potentiometer or start playing with resistors, because resistors have tolerance and you will not be able to build an exact 6.75 by just looking at values - you need to measure combinations.
There are a couple of reasons why your hot water heater would groan. The valves may not be opened correctly. Or there could be a build up of dirt on the bottom of the tank. Clean out the sediment by letting the water run out until it is clear and this should help.
currently only god holds that power. build a robot, it is much simpler; no hearts or minds, just capacitors and resistors.
Resistors do not have a polarity. BY DEFINITION, a resistor is a device that follows Ohms law, and does so regardless of the polarity in which it is inserted into a circuit. Manufacturers of resistors do all they can to make their resistors follow that definition. One way to make a resistor have no polarity is to build it so that it is mechnically symmetrical about its two leads. Doing so will ensure that it will also be electrically symmetrical, and thus non-polarized
Robert the Bruce watched the spider repeatedly building a web.
A resistor pair is two resistors, often matched as to temperature coefficient and/or tolerance. This allows you to build a highly accurate and stable voltage divider.
There are a great many things you could build a fence out of. You could build a fence out of wood.