555 (telephone number) Telephone numbers with the prefix 555 are widely used for fictitious telephone numbers in North American television shows, films, video games, and other media in order to prevent practical jokers and curious callers from bothering real people and organisations by telephoning actual numbers.
The resistance (R) of an object is defined as the ratio of voltage across it (V) to current through it (I), while the conductance (G) is the inverse: R = V I, G = I V = 1 R {\displaystyle R={V \over I},\qquad G={I \over V}={\frac {1}{R}}} For a wide variety of materials and conditions, V and I are directly proportional to each other, and therefore R ...
â To establish that in these cases of direct proportionality the resistor obeys Ohmâs Law such that I is proportional to V. â To explain that resistance is defined as R = V / I.â To establish that the resistors that are used in this experiment obey Ohmâs Law and for them the relationship V= I x R applies.