Electricity & Magnetism

What is Resistance?

• The flow of electrons
• Electric potential difference
• A battery
• The ability to reduce the flow of electrons

The mathematical relationship between Current, Voltage and Resistance

• Faraday's Law

• Coulomb's Law

• Edison's Law

• Ohm's Law

How do you calculate voltage?

• Current X Resistance
• Resistance ÷ Current
• Current ÷ Resistance
• Measure it with a ruler

What voltage is needed to cause a 2A current flow through a 10Ω resistor?

• 5V
• 0.2V
• 20V
• 200V

What voltage is needed to cause a 5A current flow through a 2Ω resistor?

• 10V
• 2.5V
• 7V
• 0.4V

What component is this?

• Ammeter
• Voltmeter
• Battery
• diode

What component is this?

• LDR
• LED
• Thermistor 
• diode

What component is this?

• Varibale resistor
• fuse
• Thermistor 
• diode

What component is this?

• Varibale resistor
• fuse
• Thermistor 
• diode

What is a formula to calculate Current

• I=Q/t
• I=Q*t
• I =V*R
• I = R/V