Electricity and Circuits

Question 1

Electrical Energy

Answer 1

is transferred in circuits to do work

Amount of energy transferred depends on the current and time

Question 2

Thermistors

Answer 2

Resistance of a thermistor depends on its temperature

Higher the temperature, the lower the resistance

Question 3

Light-Dependent Resistors

Answer 3

Resistance of a Light-Dependent resistor (LDR) is large in the dark

The resistance gets less light if light shines on it

Question 4

Ohm’s Law (Equation)

Answer 4

Potential Difference (V) = Current (A) x Resistance (^)
V = I x R

Question 5

Resistance

Answer 5

Resistance of a component is a way of measuring how hard it is for electricity to flow through it

Question 6

Ohm’s Law

Answer 6

states how the current

Question 7

Ohm’s Law

Answer 7

states how the current through a component relates to its resistance and its potential difference

Question 8

Measuring Current

Answer 8

Electric current will flow in a close circuit when there is a source of potential difference

Question 9

Charge and Current (Equation)

Answer 9

Charge (C) = Current (A) X Time (S)
Q = I x t

Question 10

Electric Current

Answer 10

is the rate flow of change
In a metal, electric current is the flow of electrons

Question 11

Parallel Circuits

Answer 11

contains more than one loop and the current will split up or recombine at the junctions

Question 12

Series Circuit (2)

Answer 12

Electrons flow clockwise in this Circuit

Ammeters have a low resistance in this circuit

The Size of the Current is the same

Question 13

Circuit Components

Answer 13

Cell (Battery) - provides a potential difference

Switches- Allows the current flow to be switched on/off

voltmeter- measures potential difference

Fixed resistor- provides fixed resistance to the flow of the current

Motor- converts electrical energy to kinetic energy