3.6 Electrical systems symbol Quiz 1

In the equation : V = ε - Ir

• I stands for current

• r is the internal resistance

• ε is the emf

• V is the terminal pd

In the equation : C = ε₀ε_rA/d

• ε₀ is the dielectric constant for air

• ε_r is the dielectric constant of a material

• d is the distance of wire in the circuit

• C is the charge

This equation : C = ε₀ε_rA/d

• shows what a capacitor value depends upon

• shows how much charge is stored on a capacitor

• shows how capacitance depends on potential difference

• shows that area depends on distance

In the equation : Q = CV

• Q is charge stored on the plates

• V is potential difference across the plates

• C is Coulomb

• C is capacitance

In the equation : E = 1/2CV²

• E stands for electric field strength

• E stands for energy stored in a capacitor

• V stands for potential difference across the capacitor plates

• V stands for potential difference across the power supply

In the equation : V = - NΔΦ/Δt

• the - sign is a mistake

• N stands for number of coils

• ΔΦ/Δt is the rate of change of magnetic flux

• V is the induced voltage

The induced voltage can be calculated using : V = BvL

• If a length of conductor is moved perpendicular across a magnetic field

• v stands for velocity

• V stands for induced voltage

• L stands for current

ΔΦ/Δt is the

• rate of change of flux

• rate of change of field

• rate of change of charge

• change of flux

Faraday's Law of Induction can be expressed with the equation

• V=-NΔΦ/Δt

• V=-Φ/Δt

• V=NΔΦ/Δt

• V=-NΔΦ/t

The equation for a transformer : V_p/V_s = N_p/N_s

• N_p is the number of turns on the secondary coil

• N_p is the number of turns on the primary coil

• Ns is the number of turns on the secondary coil

• V_s is the voltage induced in the secondary coil