| Front | what is the p.d. measured at the terminals of the power source known as |
| Back | the terminal p.d. |
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| Front | what is the cosmological principal |
| Back | the assumption that, when viewed on a large enough scale, the universe is homogenous (matter is distributed evenly) and isotropic (looks the same in all directions to every observer - no centre or edge), and the laws of physics are universal |
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| Front | What is electric current |
| Back | the rate of flow of charge |
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