What is the formula for resistance?
Voltage/ Current
Current x voltage
Voltage x resistivity
Voltage/ charge
This symbol signifies which of the following device?
Ohmeter
Ammeter
Fixed resistor
Variable resistor
Potentiometer
Which of the following can be used to measure resistance?
Voltmeter & ammeter
Potential divider
Resistor
Wheatstone bridge
Calculate the resistance of a metal wire when a voltage of 8 V across it causes a current of 2 A to flow through it.
4 ohms
16 ohms
0.25 ohms
What formula do you use for calculating resistors in parallel?
R = R₁ + R₂
1/R = 1/R₁ + 1/R₂
V = V₁ + V₂
R₁/R₂ = R₃/R₄
What is the function of a resistor?
Convert electrical potential energy to some other form of energy
Measure resistance
Split the voltage of a circuit
Calculate the total resistance in a circuit with two resistors in series. The first resistor has a resistance of 60 ohms, and the second one has a resistance of 30 ohms
90 ohms
1/90 ohms
20 ohms
1/20 ohms
What is the unit of resistivity?
Ohm
Ampere
Ohm metre
Ohm/ metre
Which of the following is inversely proportional to resistivity?
Area
Length
Resistance
Current
What are the charge carriers in an ionic solution?
Electrons
Ions
Electrodes