Module 4 - 4.3.2 Internal Resistance

Question 1

Terminal P.d.

Answer 1

the voltage across the terminals of a battery

Question 2

‘Lost Volts’

Answer 2

the p.d. across the internal resistane

Question 3

Internal Resistance

Answer 3

the resistance of the power supply

Question 4

Equation for V-I Graph

Answer 4

V = (-r) I + E

Question 5

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

Answer 5

decreases, and so the terminal p.d. decreases

Question 6

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

Answer 6

• 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