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7Electric current in gases Electric current in vacuum.docx
STUDENT NAME GRADE
(f) Formative assessment
1. Describe an electric current in:
a. gases
b. vacuum
2. State one difference and one similarity of an electric current in gasses and vacuum.
Difference
Similarity
3. Defining
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Description |
Medium |
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1 |
Contains no charged particles, it normally behaves as a perfect insulator |
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2 |
When an electric current is passed through it, emits light. |
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3 |
A force is needed for electron to move across the it because it has huge resistance. |
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4 |
Even at low voltages, electricity can in fact travel through it. |
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5 |
When a voltage is applied to the two electrodes and the pressure in the tube is reduced, eventually a pressure is reached at which a current flows, and the it begins to glow. |
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