Meanings of little dynamo in English

Why had I been so consumed by this old, fat, bombastic, lying little dynamo?

Grit has gotten tangled up in the little dynamo that runs the headlight, and he's short-circuited.

Her heart was a swiftly beating little dynamo.

The flight was soon over, and we stood admiring the machine while Norton expatiated on the compactness of his little dynamo.

Norton reached over and attached the little dynamo, at the same time setting the gyroscope at its proper angle and starting it.

But, diabolically directed, this vast energy has been used by this man to melt the wires in the little dynamo that runs Norton's gyroscope.

The power to rotate the flywheel is obtained from this little dynamo here, run by the gas-engine which also turns the propellers of the aeroplane.

I needed two little dynamos, and these I worked with a cheap gas engine.

"And the help of our little dynamo."