The binary numbers are 1 and 0. 1 means on and 0 means off usually.
Motherboard is the main circuit board. It is the plate that holds the CPU (Which is the memory.)
CPU stands for central processing unit. It's sometimes called the brain of the computer. Whenever you press a key you are sending instructions to the CPU.
RAM (random access memory)
RAM is your system's short term memory. Whenever your computer performs calculations it stores it until you need it.
The hard drive is where you software, documents and other files are stored. The hard drive is long term storage which means the data is saved even if you turn the computer off or unplug it.
Power supply unit
The power supply unit in a computer converts the power from the wall outlet to the type of power needed by the computer. It sends power from the cables to the motherboard and other components.
Most computers have expansion slots on the motherboard that allow you to add various types of expansion cards.
I HOPE YOU HAD FUN LEARNING ABOUT COMPUTERS! :)