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
