quiz 9 Flashcards
How are potential difference and current related when resistance is constant?
Directly proportional OR as potential difference increases , current increases
How does the temperature of a wire affect its resistance?
As temperature increases, resistance increases
When current passes through wires and components, what happens to them?
They heat up
State the relationship between the length of a wire and its resistance
Directly proportional
How do we check that 2 variables are directly proportional?
Divide the variables at least 3 times. Answer should be the same every time
Why is total resistance lower than the smallest resistance when resistors are connected in parallel?
More paths means more current. More current means less resistance
When resistors are connected in parallel the total resistance is
Less than the lowest resistance
What does directly proportional look like on a graph?
straight line through the origin
What is a variable resistor?
A component whose resistance can be changed
How are resistance and current related when potential difference is constant?
Inversely proportional OR as resistance increases, current decreases
Why do we switch circuits off between readings?
so the wires don’t heat up and increase resistance
How do we check that 2 variables are inversely proportional?
Multiply the variables at least 3 times. Answer should be the same every time
When resistors are connected in series the total resistance is
The sum of the resistances
