Module 4 - 4.3.2 Internal Resistance Flashcards

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1
Q

Terminal P.d.

A

the voltage across the terminals of a battery

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2
Q

‘Lost Volts’

A

the p.d. across the internal resistane

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3
Q

Internal Resistance

A

the resistance of the power supply

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4
Q

Equation for V-I Graph

A

V = (-r) I + E

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5
Q

As more lamps are added in parallel, the resistance across that section of the circuit …

A

decreases, and so the terminal p.d. decreases

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6
Q

High Voltage Power Supplies
- normal internal resistance
- high voltage power supplies’ internal resistance

A
  • usually power supplies have low internal resistance
  • so more current can flow around the circuit
  • high voltage power supplies have large internal resistance
  • as a safety feature to avoid too much current flowing
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