Yes, 12 v 5 a is 60 va, and it does not matter if it is ac or dc voltage.
A 60VA transformer can run only one 50W bulb.
No, 12 volt AC is a different from 12 volt DC. Have a second look at the 12 AC volt adapter's output label. Most adapters contain a bridge rectifier in them that makes a conversion within the adapter. An example of this is in phone chargers.
Yes, you can do this.
Yes
You can replace a battery with a battery of the same voltage but greater capacity as long as it will physically fit.
To convert power from 1500 watts at 240V to 375 watts at 12V, you can use the formula P=VI (power = voltage * current). First, calculate the current at 240V by rearranging the formula to I=P/V. Then, input the current calculated at 240V into the formula to solve for the current at 12V. Finally, rearrange the formula P=VI to solve for the power at 12V using the current calculated in the previous step.
No, it does not have enough capacity (i.e. ah rating).
No, the new adapter will not be able to safely supply enough current.
No, the replacement adapter has to be of an equal or greater value but never lower.
Yes, both batteries perform the same, but the 7ah battery holds more charge.
The last fuse on the right it should be a red one 10 amp pull it out and put a new one In Hut
Yes, you can use a 12V 26Ah battery to replace a 12V 18Ah battery, as the voltage is the same. The 26Ah battery has a higher capacity, which means it can provide power for a longer duration before needing to be recharged. However, ensure that the physical size and connectors are compatible with your application. Always monitor for any potential issues, such as overcharging or overheating.