Transposition of formula

 $T=\frac{1}{f}$  
one cycle is 15.38 milliseconds. What is the frequency to 2 d.p?

 $e=\beta lv$  
The induced EMF is 90V and the length of the conductor is 3m if the strength of the magnetic field is 1.5T what speed is the conductor moving through the field?

 $\frac{1}{R_t}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}...$  
The total resistance for a circuit is 2.48 $\Omega$  Resistor 1 is  $6\Omega$  and resistor 2 is  $8\Omega$  what is the value of resistance for resistor 3 to 2 d.p?

 $R=\frac{\rho l}{a}$  
If the total resistance of a cable is 71.6m $\Omega$ , the CSA of the cable is 6 $mm^2$  and coppers resistivity is taken at 17.2 $\times10^{-9}$  what is the length of the cable to 2 d.p

 $Z=\sqrt{R^2+X_L^2}$  
In an RL circuit the inductive reactance is 13.67 $\Omega$  and the impedance is 31.38 $\Omega$  what is the resistance of the circuit to 2 d.p?

 $X_L=2\pi fl$  
The inductive reactance of a circuit is 18.85 $\Omega$  and the inductance is 0.05H what is the frequency?

 $\frac{V_P}{V_S}=\frac{N_P}{N_S}=\frac{I_S}{I_P}$  
The primary Voltage of a transformer is 100 V, the number of primary turns is 65 and the number of turns on the secondary side of the transformer is 195. What is the secondary Voltage?