Pic. 15.13. Rheostat: 1 - Decorative switch panel; 2 - Button; 3 - Nut; 4 - Washer; 5 - Rheostat
Examination
1. Connect the battery and 40W test light (pic. 15.14).
Pic. 15.14. Checking the rheostat
2. The rheostat is in order if, when it is rotated, the light of the bulb changes evenly and without blinking.