Current electricity

The table shows the resistivity, length and cross-sectional area of wires P and Q.

	Resistivity	Length	Cross-sectional area
Wire P	$ρ\rho$	$L$	$A$
Wire Q	$3ρ3\rho$	$L$	2A

The resistance of wire P is $R$ .

What is the total resistance of the wires when they are connected in parallel?

$25R\frac{2}{5}R$

$35R\frac{3}{5}R$

$32R\frac{3}{2}R$

$52R\frac{5}{2}R$

The table shows the resistivity, length and cross-sectional area of wires P and Q.

	Resistivity	Length	Cross-sectional area
Wire P	$ρ\rho$	$L$	$A$
Wire Q	$3ρ3\rho$	$L$	2A

The resistance of wire P is $R$ .

What is the total resistance of the wires when they are connected in parallel?

$25R\frac{2}{5}R$

$35R\frac{3}{5}R$

$32R\frac{3}{2}R$

$52R\frac{5}{2}R$

Current electricity Questions