2.3- Currents In Electrical Circuits

Question 1

What is happening when two insulators are being rubbed together?

Answer 1

Electrons move from one to the other

Question 2

What happens to the insulator which has gained electrons?

Answer 2

It becomes negatively charged

Question 3

What is required in a circuit with a thermistor?

Answer 3

Thermostat

Question 4

In a thermistor, low temperature =

Answer 4

High resistance

Question 5

At a constant temperature, the current through a resistor…

Answer 5

Is directly proportional to the potential difference across it

Question 6

Bigger resistance =

Answer 6

Smaller current

Question 7

For components in series, resistance is

Answer 7

The sum of the resistance of each component

Question 8

For components on series, the current

Answer 8

Is the same in each component

Question 9

For components connected in series, the voltage

Answer 9

Is shared between each component

Question 10

For components connected in parallel, the voltage

Answer 10

Is the same across each component

Question 11

For components connected in parallel, the total current

Answer 11

Is the sum of the current through the separate components

Question 12

As resistance of a filament bulb increases…

Answer 12

The temperature increases

Question 13

The current through a diode…

Answer 13

Flows in only one direction (very high resistance in other direction)

Question 14

LEDs are being used more because…

Answer 14

They require less current than other bulbs

Question 15

In an LDR, as light intensity increases…

Answer 15

Resistance decreases