6.2 Electricity Flashcards
How can electrical charge flow through a closed circuit
The circuit needs to include a source of potential difference
What’s electrical current
A flow of electrical charge
What’s the size of current
The rate of flow of electrical charge
Equation linking charge flow, current and time
Charge flow = current x time
Q = I x t
What’s charge flow (Q) measured in
Coulombs C
What’s current (I) measured in
Amps A
What’s time (t) measured in
Seconds s
What is the current value at any point in a single closed loop
The same
The greater the resistance….
The smaller the current
equation linking pd current and resistance
Pd = current x resistance
V = I x R
What’s pd (V) measured in
Volts V
What’s current (I) measured in
Amps A
What’s resistance (R) measured in
Ohms
What’s the aim of the resistance practical
To investigate that factors that affect resistance
What’s the independent variable
Length of wire
Combination if resistors
What’s the dependant variable
Current
Voltage
